PG15491.B01003
In _September_ and _October, 1661._ I observ’d in _Oxford_ several of these little pretty Creatures to wander to and fro, and often to travel over the plains of my Window. And in _September_ and _October, 1663._ I observ’d likewise several of these very same Creatures traversing a window at _London_, and looking without the window upon the subjacent wall, I found whole flocks of the same kind running to and fro among the small groves and thickets of green moss, and upon the curiously spreading vegetable blew or yellow moss, which is a kind of a Mushrome or Jews-ear.

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These Creatures to the naked eye seemed to be a kind of black Mite, but much nimbler and stronger then the ordinary Cheese-Mites; but examining them in a _Microscope_, I found them to be a very fine crusted or shell’d Insect, much like that represented in the first Figure of the three and thirtieth _Scheme_, with a protuberant oval shell A, indented or pitted with an abundance of small pits, all covered over with little white brisles, whose points all directed backwards.

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It had eight legs, each of them provided with a very sharp tallon, or claw at the end, which this little Animal, in its going, fastned into the pores of the body over which it went. Each of these legs were bestuck in every joynt of them with multitudes of small hairs, or (if we respect the proportion they bore to the bigness of the leg) turnpikes, all pointing towards the claws.

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The _Thorax_, or middle parts of the body of this Creature, was exceeding small, in respect both of the head and belly, it being nothing but that part which was covered by the two shells BB, though it seem’d to grow thicker underneath: And indeed, if we consider the great variety Nature uses in proportioning the three parts of the body, (the _Head_, _Thorax_, and _Belly_) we shall not wonder at the small proportion of this _Thorax_, nor at the vaster bulk of the belly, for could we exactly anatomise this little Creature, and observe the particular designs of each part, we should doubtless, as we do in all her more manageable and tractable fabricks, find much more reason to admire the excellency of her contrivance and workmanship, then to wonder, it was not made otherwise.

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The head of this little Insect was shap’d somewhat like a Mite’s, that is, it had a long snout, in the manner of a Hogs, with a knobbed ridge running along the middle of it, which was bestuck on either side with many small brisles, all pointing forward, and two very large pikes or horns, which rose from the top of the head, just over each eye, and pointed forward also. It had two pretty large black eyes on either side of the head EE, from one of which I could see a very bright reflection of the window, which made me ghess, that the _Cornea_ of it was smooth, like those of bigger Insects. Its motion was pretty quick and strong, it being able very easily to tumble a stone or clod four times as big as its whole body.

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At the same time and place, and divers times since, I have observed with my _Microscope_, another little Insect, which, though I have not annexed the picture of, may be worth noting, for its exceeding nimbleness as well as smalness; it was as small as a Mite, with a body deep and ridged, almost like a Flea; it had eight blood-red legs, not very long, but slender; and two horns or feelers before. Its motion was so exceeding quick, that I have often lost sight of one I have observed with my naked eye; and though, when it was not frighted, I was able to follow the motions of some with my _Microscope_; yet if it were never so little startled, it posted away with such speed, and turn’d and winded it self so quick, that I should presently lose sight of it.

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When I first observ’d the former of these Insects, or Mites, I began to conjecture, that certainly I had found out the vagabond Parents of those Mites we find in Cheeses, Meal, Corn, Seeds, musty Barrels, musty Leather, &c. these little Creatures, wandring to and fro every whither, might perhaps, as they were invited hither and thither by the musty steams of several putrifying bodies, make their invasions upon those new and pleasing territories, and there spending the remainder of their life, which might be perhaps a day, or thereabouts, in very plentiful and riotous living, might leave their offspring behind them, which by the change of the soil and Country they now inhabite, might be quite alter’d from the hew of their _primogenitors_, and, like _Mores_ translated into Northern _European_ Climates, after a little time, change both their skin and shape. And this seems yet more probable in these Insects, because that the soil or body they inhabit, seems to be almost half their parent, for it not only hatches and brings those little eggs, or seminal principles, to perfection, but seems to augment and nourish them also before they are hatch’d or shaped; for it is obvious enough to be observ’d, that the eggs of many other Insects, and particularly of Mites, are increas’d in bulk after they are laid out of the bodies of the Insects, and plump’d sometimes into many times their former bigness, so that the bodies they are laid in being, as it were, half their mothers, we shall not wonder that it should have such an active power to change their forms. We find by relations how much the _Negro_ Women do besmeer the of-spring of the _Spaniard_, bringing forth neither white-skinn’d nor black, but tawny hided _Mulattos_.

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Now, though I propound this as probable, I have not yet been so farr certify’d by Observations as to conclude any thing, either positively or negatively, concerning it. Perhaps, some more lucky diligence may please the curious Inquirer with the discovery of this, to be a truth, which I now conjecture, and may thereby give him a satisfactory account of the cause of those creatures, whose original seems yet so obscure, and may give him cause to believe, that many other animate beings, that seem also to be the mere product of putrifaction, may be innobled with a Pedigree as antient as the first creation, and farr exceed the greatest beings in their numerous Genealogies. But on the other side, if it should be found that these, or any other animate body, have no immediate similar Parent, I have in another place set down a conjectural _Hypothesis_ whereby those _Phænomena_ may likely enough be solv’d, wherein the infinite wisdom and providence of the Creator is no less rare and wonderfull.

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Observ. LI. _Of the _Crab-like_ Insect._

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Reading one day in _Septemb._ I chanced to observe a very smal creature creep over the Book I was reading, very slowly; having a _Microscope_ by me, I observ’d it to be a creature of a very unusual form, and that not less notable; such as is describ’d in the second _Figure_ of the 33. _Scheme_. It was about the bigness of a large Mite, or somewhat longer, it had ten legs, eight of which, AAAA, were topt with very sharp claws, and were those upon which he walk’d, seeming shap’d much like those of a Crab, which in many other things also this little creature resembled; for the two other claws, BB, which were the formost of all the ten, and seem’d to grow out of his head, like the horns of other Animals, were exactly form’d in the manner of Crabs or Lobsters claws, for they were shap’d and jointed much like those represented in the _Scheme_ and the ends of them were furnish’d with a pair of claws or pincers, CC, which this little animal did open and shut at pleasure: It seem’d to make use of those two horns or claws both for feelers and holders; for in its motion it carried these aloft extended before, moving them to and fro, just as a man blindfolded would do his hands when he is fearfull of running against a wall, and if I put a hair to it, it would readily take hold of it with these claws, and seem to hold it fast. Now, though these horns seem’d to serve him for two uses, namely, for feeling and holding; yet he seem’d neither blind, having two small black spots, DD, which by the make of them, and the bright reflection from them seem’d to be his eyes, nor did it want other hands, having another pair of claws, EE, very neer plac’d to its mouth, and seem’d adjoining to it.

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The whole body was cased over with armour-shells, as is usuall in all those kinds of _crustaceous_ creatures, especially about their bellies, and seem’d of three kinds, the head F seem’d cover’d with a kind of scaly shell, the _thorax_ with two smooth shells, or Rings, GG, and the belly with eight knobb’d ones. I could not certainly find whether it had under these last shells any wings, but I suspect the contrary; for I have not found any wing’d Insect with eight leggs, two of those leggs being always converted into wings, and, for the most part, those that have but six, have wings.

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This creature, though I could never meet with more then one of them, and so could not make so many examinations of it as otherwise I would, I did notwithstanding, by reason of the great curiosity that appear’d to me in its shape, delineate it, to shew that, in all likelihood, Nature had crouded together into this very minute Insect, as many, and as excellent contrivances, as into the body of a very large Crab, which exceeds it in bulk, perhaps, some Millions of times; for as to all the apparent parts, there is a greater rather then a less multiplicity of parts, each legg has as many parts, and as many joints as a Crabs, nay, and as many hairs or brisles; and the like may be in all the other visible parts; and ’tis very likely, that the internal curiosities are not less excellent: It being a general rule in Nature’s proceedings, that where she begins to display any excellency, if the subject be further search’d into, it will manifest, that there is not less curiosity in those parts which our single eye cannot reach, then in those which are more obvious.

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Observ. LII. _Of the small Silver-colour’d _Book-worm_._

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As among greater Animals there are many that are scaled, both for ornament and defence, so are there not wanting such also among the lesser bodies of Insects, whereof this little creature gives us an Instance. It is a small white Silver-shining Worm or Moth, which I found much conversant among Books and Papers, and is suppos’d to be that which corrodes and eats holes through the leaves and covers; it appears to the naked eye, a small glittering Pearl-colour’d Moth, which upon the removing of Books and Papers in the Summer, is often observ’d very nimbly to scud, and pack away to some lurking cranney, where it may the better protect itself from any appearing dangers. Its head appears bigg and blunt, and its body tapers from it towards the tail, smaller and smaller, being shap’d almost like a Carret.

PG15491.B01019
This the _Microscopical_ appearance will more plainly manifest, which exhibits, in the third _Figure_ of the 33. _Scheme_, a conical body, divided into fourteen several partitions, being the appearance of so many several shels, or shields that cover the whole body, every of these shells are again cover’d or tiled over with a multitude of thin transparent scales, which, from the multiplicity of their reflecting surfaces, make the whole Animal appear of a perfect Pearl-colour.

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Which, by the way, may hint us the reason of that so much admired appearance of those so highly esteem’d bodies, as also of the like in mother of Pearl shells, and in multitudes of other shelly Sea-substances; for they each of them consisting of an infinite number of very thin shells or laminated orbiculations, cause such multitudes of reflections, that the compositions of them together with the reflections of others that are so thin as to afford colours (of which I elsewhere give the reason) gives a very pleasant reflection of light. And that this is the true cause, seems likely, first, because all those so appearing bodies are compounded of multitudes of plated substances. And next that, by ordering any trasparent substance after this manner, the like _Phænomena_ may be produc’d; this will be made very obvious by the blowing of Glass into exceeding thin shells, and then breaking them into scales, which any lamp-worker will presently do; for a good quantity of these scales, laid in a heap together, have much the same resemblance of Pearls. Another way, not less instructive and pleasant, is a way which I have several times done, which is by working and tossing, as ’twere, a parcel of pure crystalline glass whilst it is kept glowing hot in the blown flame of a Lamp, for, by that means, that purely transparent body will be so divided into an infinite number of plates, or small strings, with interpos’d aerial plates and _fibres_, that from the multiplicity of the reflections from each of those internal surfaces, it may be drawn out into curious Pearl-like or Silver wire, which though small, will yet be opacous; the same thing I have done with a composition of red _Colophon_ and _Turpentine_, and a little Bee’s Wax, and may be done likewise with Birdlime, and such like glutinous and transparent bodies: But to return to our description.

PG15491.B01021
The small blunt head of this Insect was furnish’d on either side of it with a cluster of eyes, each of which seem’d to contain but a very few, in comparison of what I had observ’d the clusters of other Insects to abound with; each of these clusters were beset with a row of small brisles, much like the _cilia_ or hairs on the eye-lids, and, perhaps, they serv’d for the same purpose. It had two long horns before, which were streight, and tapering towards the top, curiously ring’d or knobb’d, and brisled much like the Marsh Weed, call’d Horse-tail, or Cats-tail, having at each knot a fring’d Girdle, as I may so call it, of smaller hairs, and several bigger and larger brisles, here and there dispers’d among them: besides these, it had two shorter horns, or feelers, which were knotted and fring’d, just as the former, but wanted brisles, and were blunt at the ends; the hinder part of the creature was terminated with three tails, in every particular resembling the two longer horns that grew out of the head: The leggs of it were scal’d and hair’d much like the rest, but are not express’d in this _Figure_, the Moth being intangled all in Glew, and so the leggs of this appear’d not through the Glass which looked perpendicularly upon the back.

PG15491.B01022
This Animal probably feeds upon the Paper and covers of Books, and perforates in them several small round holes, finding, perhaps, a convenient nourishment in those husks of Hemp and Flax, which have pass’d through so many scourings, washings, dressings and dryings, as the parts of old Paper must necessarily have suffer’d; the digestive faculty, it seems, of these little creatures being able yet further to work upon those stubborn parts, and reduce them into another form.

PG15491.B01023
And indeed, when I consider what a heap of Saw-dust or chips this little creature (which is one of the teeth of Time) conveys into its intrals, I cannot chuse but remember and admire the excellent contrivance of Nature, in placing in Animals such a fire, as is continually nourished and supply’d by the materials convey’d into the stomach, and _fomented_ by the bellows of the lungs; and in so contriving the most admirable fabrick of Animals, as to make the very spending and wasting of that fire, to be instrumental to the procuring and collecting more materials to augment and cherish it self, which indeed seems to be the principal end of all the contrivances observable in bruit Animals.

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Observ. LIII. _Of a _Flea_._

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The strength and beauty of this small creature, had it no other relation at all to man, would deserve a description.

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For its strength, the _Microscope_ is able to make no greater discoveries of it then the naked eye, but onely the curious contrivance of its leggs and joints, for the exerting that strength, is very plainly manifested, such as no other creature, I have yet observ’d, has any thing like it; for the joints of it are so adapted, that he can, as ’twere, fold them short one within another, and suddenly stretch, or spring them out to their whole length, that is, of the fore-leggs, the part A, of the 34. _Scheme_, lies within B, and B within C, parallel to, or side by side each other; but the parts of the two next, lie quite contrary, that is, D without E, and E without F, but parallel also; but the parts of the hinder leggs, G, H and I, bend one within another, like the parts of a double jointed Ruler, or like the foot, legg and thigh of a man; these six leggs he clitches up altogether, and when he leaps, springs them all out, and thereby exerts his whole strength at once.

PG15491.B01028
But, as for the beauty of it, the _Microscope_ manifests it to be all over adorn’d with a curiously polish’d suit of _sable_ Armour, neatly jointed, and beset with multitudes of sharp pinns, shap’d almost like Porcupine’s Quills, or bright conical Steel-bodkins; the head is on either side beautify’d with a quick and round black eye K, behind each of which also appears a small cavity, L, in which he seems to move to and fro a certain thin film beset with many small transparent hairs, which probably may be his ears; in the forepart of his head, between the two fore-leggs, he has two small long jointed feelers, or rather smellers, MM, which have four joints, and are hairy, like those of several other creatures; between these, it has a small _proboscis_, or _probe_, NNO, that seems to consist of a tube NN, and a tongue or sucker O, which I have perceiv’d him to slip in and out. Besides these, it has also two chaps or biters PP, which are somewhat like those of an Ant, but I could not perceive them tooth’d; these were shap’d very like the blades of a pair of round top’d Scizers, and were opened and shut just after the same manner; with these Instruments does this little busie Creature bite and pierce the skin, and suck out the blood of an Animal, leaving the skin inflamed with a small round red spot. These parts are very difficult to be discovered, because, for the most part, they lye covered between the fore-legs. There are many other particulars, which, being more obvious, and affording no great matter of information, I shall pass by, and refer the Reader to the Figure.

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Observ. LIV. _Of a Louse._

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This is a Creature so officious, that ’twill be known to every one at one time or other, so busie, and so impudent, that it will be intruding it self in every ones company, and so proud and aspiring withall, that it fears not to trample on the best, and affects nothing so much as a Crown; feeds and lives very high, and that makes it so saucy, as to pull any one by the ears that comes in its way, and will never be quiet till it has drawn blood: it is troubled at nothing so much as at a man that scratches his head, as knowing that man is plotting and contriving some mischief against it, and that makes it oftentime sculk into some meaner and lower place, and run behind a mans back, though it go very much against the hair; which ill conditions of it having made it better known then trusted, would exempt me from making any further description of it, did not my faithful _Mercury_, my _Microscope_, bring me other information of it. For this has discovered to me, by means of a very bright light cast on it, that it is a Creature of a very odd shape; it has a head shap’d like that exprest in 35. _Scheme_ marked with A, which seems almost Conical, but is a little flatted on the upper and under sides, at the biggest part of which, on either side behind the head (as it were, being the place where other Creatures ears stand) are placed its two black shining goggle eyes BB, looking backwards, and fenced round with several small _cilia_, or hairs that incompass it, so that it seems this Creature has no very good foresight: It does not seem to have any eye-lids, and therefore perhaps its eyes were so placed, that it might the better cleanse them with its fore-legs; and perhaps this may be the reason, why they so much avoid and run from the light behind them, for being made to live in the shady and dark recesses of the hair, and thence probably their eye having a great aperture, the open and clear light, especially that of the Sun, must needs very much offend them; to secure these eyes from receiving any injury from the hairs through which it passes, it has two horns that grow before it, in the place where one would have thought the eyes should be; each of these CC hath four joynts, which are fringed, as ’twere, with small brisles, from which to the tip of its snout D, the head seems very round and tapering, ending in a very sharp nose D, which seems to have a small hole, and to be the passage through which he sucks the blood. Now whereas if it be plac’d on its back, with its belly upwards, as it is in the 35. _Scheme_, it seems in several Positions to have a resemblance of chaps, or jaws, as is represented in the Figure by EE, yet in other postures those dark strokes disappear; and having kept several of them in a box for two or three dayes, so that for all that time they had nothing to feed on, I found, upon letting one creep on my hand, that it immediately fell to sucking, and did neither seem to thrust its nose very deep into the skin, nor to open any kind of mouth, but I could plainly perceive a small current of blood, which came directly from its snout, and past into its belly; and about A there seem’d a contrivance, somewhat resembling a Pump, pair of Bellows, or Heart, for by a very swift _systole_ and _diastole_ the blood seem’d drawn from the nose, and forced into the body. It did not seem at all, though I viewed it a good while as it was sucking, to thrust more of its nose into the skin then the very snout D, nor did it cause the least discernable pain, and yet the blood seem’d to run through its head very quick and freely, so that it seems there is no part of the skin but the blood is dispers’d into, nay, even into the _cuticula_; for had it thrust its whole nose in from D to CC, it would not have amounted to the supposed thickness of that _tegument_, the length of the nose being not more then a three hundredth part of an inch. It has six legs, covered with a very transparent shell, and joynted exactly like a Crab’s, or Lobster’s; each leg is divided into six parts by these joynts, and those have here and there several small hairs; and at the end of each leg it has two claws, very properly adapted for its peculiar use, being thereby inabled to walk very securely both on the skin and hair; and indeed this contrivance of the feet is very curious, and could not be made more commodiously and compendiously, for performing both these requisite motions, of walking and climbing up the hair of a mans head, then it is: for, by having the lesser claw (a) set so much short of the bigger (b) when it walks on the skin the shorter touches not, and then the feet are the same with those of a Mite, and several other small Insects, but by means of the small joynts of the longer claw it can bend it round, and so with both claws take hold of a hair, in the manner represented in the Figure, the long transparent Cylinder FFF, being a Man’s hair held by it.

PG15491.B01032
The _Thorax_ seem’d cas’d with another kind of substance then the belly, namely, with a thin transparent horny substance, which upon the fasting of the Creature did not grow flaccid; through this I could plainly see the blood, suck’d from my hand, to be variously distributed, and mov’d to and fro; and about G there seem’d a pretty big white substance, which seem’d to be moved within its _thorax_; besides, there appear’d very many small milk-white vessels, which crost over the breast between the legs, out of which, on either side, were many small branchings, these seem’d to be the veins and arteries, for that which is analogus to blood in all Insects is milk-white.

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The belly is covered with a transparent substance likewise, but more resembling a skin then a shell, for ’tis grain’d all over the belly just like the skin in the palms of a man’s hand, and when the belly is empty, grows very flaccid and wrinkled; at the upper end of this is placed the stomach HH, and perhaps also the white spot II may be the liver or _pancreas_, which, by the _peristalick_ motion of the guts, is a little mov’d to and fro, not with a _systole_ and _diastole_, but rather with a thronging or justling motion. Viewing one of these Creatures, after it had fasted two dayes, all the hinder part was lank and flaccid, and the white spot II hardly mov’d, most of the white branchings disappear’d, and most also of the redness or sucked blood in the guts, the _peristaltick_ motion of which was scarce discernable; but upon the suffering it to suck, it presently fill’d the skin of the belly, and of the six scolop’d embosments on either side, as full as it could be stuft, the stomach and guts were as full as they could hold; the _peristaltick_ motion of the gut grew quick, and the justling motion of II accordingly; multitudes of milk-white vessels seem’d quickly filled, and turgid, which were perhaps the veins and arteries and the Creature was so greedy, that though it could not contain more, yet it continued sucking as fast as ever, and as fast emptying it self behind: the digestion of this Creature must needs be very quick, for though I perceiv’d the blood thicker and blacker when suck’d, yet, when in the guts, it was of a very lovely ruby colour, and that part of it, which was digested into the veins, seemed white; whence it appears, that a further digestion of blood may make it milk, at least of a resembling colour: What is else observable in the figure of this Creature, may be seen by the 35. _Scheme_.

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Observ. LV. _Of _Mites_._

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The least of _Reptiles_ I have hitherto met with, is a Mite, a Creature whereof there are some so very small, that the sharpest sight, unassisted with Glasses, is not able to discern them, though, being white of themselves, they move on a black and smooth surface; and the Eggs, out of which these Creatures seem to be hatch’d, are yet smaller, those being usually not above a four or five hundredth part of a well grown Mite, and those well grown Mites not much above one hundredth of an inch in thickness; so that according to this reckoning there may be no less then a million of well grown Mites contain’d in a cubick inch, and five hundred times as many Eggs.
