PG54897.B00644
Huyghens, his doctrine of light, 207. Ascertains the laws of double refraction, 254.

PG54897.B00645
Hydrostatics, first step towards a knowledge of, made by Archimedes, 231. Law of the equal pressure of liquids, 232. General applicability of, 232.

PG54897.B00646
Hypothesis, not to be deterred from framing them, 196. Conditions on which they should be framed, 197. Illustrated by the laws of gravitation, 198. Use and abuse of, 204.

PG54897.B00647
Induction, different ways of carrying it on, 102. Steps by which it is arrived at on a legitimate and extensive scale, 118. First stage of, 144. Verification of, 164. Instanced in astronomy, 166. Must be followed into all its consequences, and applied to all those cases which seem even remotely to bear upon the subject of enquiry, 173. Nature of the inductions by which quantitative laws are arrived at, 176. Necessity of induction embracing a series of cases which absolutely include the whole scale of variation of which the quantities in question admit, 177.

PG54897.B00648
Induced electricity, 333.

PG54897.B00649
Inertia, 223.

PG54897.B00650
Iodine, discovery of, 50. Efficacy of, in curing goître, 51.

PG54897.B00651
Isomorphism, law of, 170.

PG54897.B00652
Kepler, effect of his discoveries on the Aristotelian philosophy, 113. Nature of his laws of the planetary system, 178. Proofs of the Newtonian system, 179.

PG54897.B00653
Knowledge, physical facts illustrative of the utility of, 45. Diffusion of, how to take advantage of in the investigation of nature, 138.

PG54897.B00654
Lagrange, his improvements on Newton’s theory of sound, 247. His astronomical researches, 275.

PG54897.B00655
Lamp, safety, 55.

PG54897.B00656
Laplace, his explanation of the residual velocity of sound and confirmation of the general law of the developement of heat by compression, 172. His astronomical research, 275. His experiments on the dilatation of bodies by heat, 319. His study of specific heat, 323. Latent heat, 323.

PG54897.B00657
Laws, inductive, 171. General, 198. How applicable, 199. Illustrated by the planetary system, 201. Empirical laws, 178.

PG54897.B00658
Lavoisier, his improvements in chemical science, 302. Experiments on dilatation of bodies by heat, 319. His investigation on specific heat, 323.

PG54897.B00659
Light, refraction of, 30. Double refraction of, 31. Polarization of, 254.

PG54897.B00660
Light and vision, ignorance of the ancients respecting, 249.

PG54897.B00661
Lighthouse, 56.

PG54897.B00662
Lightning, how to judge philosophically of it, 120. Returning stroke of, 121.

PG54897.B00663
Liquids, cohesion, attraction and repulsion of the particles of, 227. Differ from aëriform fluids by their cohesion, 233. The Florentine experiment on; experiments by Canton, Perkins, Oërsted, and others on, 235. Obscurity of the laws of dilatation of, 320.

PG54897.B00664
Linnæus, his knowledge of crystalline substances, 239.

PG54897.B00665
Logic, 19.

PG54897.B00666
Lyell’s Principles of Geology, extract from, 146.

PG54897.B00667
Magnetism may be caused by electricity, 93. Offers a “glaring instance” of polarity, 326. Experiments illustrative of, 327.

PG54897.B00668
Malus, a French officer of engineers, discovers the polarization of light, 132, 258.

PG54897.B00669
Man, regarded as a creature of instinct, 1. Of reason and speculation, 3. His will determined by causes and consequences, 6. Advantages to, from the study of science, 7. His necessity to study the laws of nature illustrated, 66. Happiness and the opposite state of man in the aggregate, 67. Advantages conferred on, by the augmentation of physical resources, 68. Advantages from intellectual resources, 69.

PG54897.B00670
Mariotte, his law of equilibrium of an elastic fluid recently verified by the Royal Academy of Paris, 231. His difference between solar and other heat, 315.

PG54897.B00671
Matter, indestructibility of; Divided by grinding, 40. By fire, 41. Dilated by heat, 193. Inertia of, 202. Polarity of, one of the ultimate phenomena to which the analysis of nature leads us, 245. Inherent activity of, 297. Causes of the polarity of, 299. Imponderable forms of, 310.

PG54897.B00672
Measure, the standard, difficulty of preserving it unaltered, 128. How to be assisted in measurement, 129. Our conclusions from, should be conditional, 130.

PG54897.B00673
Menai Bridge, weight and height of, 60.

PG54897.B00674
Mechanics, practical, 63.

PG54897.B00675
Mètre, the French, 126.

PG54897.B00676
Microscopes, power of, 191.

PG54897.B00677
Millstones, method of making in France, 48.

PG54897.B00678
Mind, its transition from the little to the great, and _vice versâ_, illustrated, 172.

PG54897.B00679
Mineralogy unknown to the ancients, 79. Prejudiced by the rage for nomenclature, 139. Benefited by the progress of chemical analysis, 293.

PG54897.B00680
Minerals, simple, apparent paucity of, 294. Difficulty in classing them, 295.

PG54897.B00681
Mitscherlich, his law of isomorphism, 170. His experiments on the expansion of substances by heat, 243.

PG54897.B00682
Motion, 87. Simplicity and precision of the laws of, 179.

PG54897.B00683
Nature, laws of, 37. Immutability of, 42. Harmony of, and advantage of studying them, 43. Prove the impossibility of attaining the declared object of the alchemist. How they serve mankind generally, 44. Illustrated by mining, 45. Economy derived from a knowledge of, 65. How to be regarded, 100, 101.

PG54897.B00684
Nature, objects of, an enumeration and nomenclature of, useful in the study of, 135. Mechanism of, on too large or too small a scale to be immediately cognisable by our senses, 191.

PG54897.B00685
Newton, his proof of Galileo’s laws of gravitation by an experiment with a hollow glass pendulum, 160. His foundation to hydrodynamical science, 181. Fixes the division between statics and dynamics, 223. His investigation of the law of equilibrium of elastic fluids, 231. His law of hydrostatics, 232. His foundation of hydrodynamics 236. His analysis of sound, 247. Hypothesis of light, 250. Examination of a soap-bubble, 252. His hypothesis of fits of easy transmission and reflection, 253. His combination of mathematical skill with physical research, 271. His Principia, 272. His successors; his geometry, 273.

PG54897.B00686
Nomenclature, importance of, to science, 136. More a consequence than a cause of extended knowledge, 138. Prejudicial to mineralogy, 139.

PG54897.B00687
Norman, Robert, his discovery of the dip of the needle, 327.

PG54897.B00688
Numerical precision, necessity of, in science, 122.

PG54897.B00689
Objects, and their mutual actions, subjects of contemplation, 118.

PG54897.B00690
Observation, a means of acquiring experience, 76. Passive and active, 77. Recorded observation, 120. Necessity of, to acquire precise physical data, 215. Illustrated by the barometer, 216.

PG54897.B00691
Oërsted, his discoveries in electricity and magnetism, 132. Of electro-magnetism, 340.

PG54897.B00692
Opacity, 189.

PG54897.B00693
Otto von Guericke of Magdeburgh, his invention of the air-pump, 230.

PG54897.B00694
Paracelsus, power of his chemical remedies; his use of mercury, opium, and tartar, 112.

PG54897.B00695
Pascal, his crucial instances proving the weight of air, 229.

PG54897.B00696
Pendulum, 126.

PG54897.B00697
Phenomena, analysis of, illustrated by musical sounds, the sensation of taste, 85. The ultimate and inward process of nature in the production of, 86. Analysis of complex phenomena, 88. Ultimate phenomena, 90. How the analysis of, is useful, 97. A transient phenomenon, how to judge of, 122. Method of explaining one when it presents itself, 148. How to discover the cause of one, 150. Two, or many, theories, maintained as the origin of, in physics, 195. Cosmical phenomena, 265.

PG54897.B00698
Philosophy, natural, unfounded objections to the study of, 7. Advantages derivable from the study of, 10. Pleasure and happiness, the consequences of the study of, 15.

PG54897.B00699
Phlogistic doctrines of Beccher and Stahl, 300.

PG54897.B00700
Physical data, necessity of, 209. Great importance of, 211. Illustrated by the erection of observatories, 213. Necessity of an exact knowledge of, 214. More precise than the observations by which we acquire them, 215.

PG54897.B00701
Physics, axioms of; analysis of, 102.

PG54897.B00702
Planets, circumjovial, 186.

PG54897.B00703
Platina, discovery of, 308.

PG54897.B00704
Pliny, his knowledge of quartz and diamond, 239.

PG54897.B00705
Pneumatics, 228.

PG54897.B00706
Political economy, 73.

PG54897.B00707
Prejudices of opinion and sense, 80. Conditions on which such are injurious, 81. Illustrated by the division of the rays of light, by the moon at the horizon, and by ventriloquism, 82. By the transition of the hand from heat to cold, 83.

PG54897.B00708
Prevost, M., his theory of heat, 316. His theory of reciprocal interchanges, a proof of the radiation of cold, 318.

PG54897.B00709
Printing, the art of, 193. Performed by steam, 194.

PG54897.B00710
Probabilities, doctrine of, 217. Illustrated by shooting at a wafer, 218.

PG54897.B00711
Prout, Dr., his opinion of the atomic weights, 307.

PG54897.B00712
Pyrometry, 319.

PG54897.B00713
Pythagoras, philosophy of, 107.

PG54897.B00714
Quinine, sulphate of, comparative comfort and health resulting from the use of, 56.

PG54897.B00715
Radiation of heat, laws of, 205.

PG54897.B00716
Repulsion in fluids and solids, 227.

PG54897.B00717
Rules, general, for guiding and facilitating our search among a great mass of assembled facts, 151.

PG54897.B00718
Rumford, count, experiments of, on gunpowder, 62.

PG54897.B00719
Savart, M., his experiments on solids, 243. His researches on sound, 249.

PG54897.B00720
Science, abstract, a preparation for the study of physics, 19. Not indispensable to the study of physical laws, 25. Instances illustrative of, 27.

PG54897.B00721
Science, physical, nature and objects, immediate and collateral, as regarded in itself and in its application to the practical purposes of life, and its influence on society, 35. State of, previous to the age of Galileo and Bacon, 104. Causes of the rapid advance of, compared with the progress at an earlier period, 347.

PG54897.B00722
Science, natural, cause and effect, the ultimate relations of, 76.

PG54897.B00723
Sciences and Arts, remarks on the language, terms, or signs used in treating of them, 70. Receive an impulse by the Baconian philosophy, 114.

PG54897.B00724
Sensation, cause of, 91.

PG54897.B00725
Senses, inadequate to give us direct information for the exact comparison of quantity, 124. Substitutes for the inefficiency of, 125.

PG54897.B00726
Seringapatam, method of breaking blocks from the quarries of, 47.

PG54897.B00727
Shells found in rocks at a great height above the sea, supposed cause of, 145.

PG54897.B00728
Smeaton, his experiments on bodies dilated by heat, 319.

PG54897.B00729
Solids, transparent, exhibit periodical colours when exposed to polarized light, 99. Influence of, on the Mind, 101.

PG54897.B00730
Solids in general, nature of, 236. Constitution of, complicated, 237. Toughness of, distinct from hardness; tenacity of, 238. Become liquefied by the addition of heat, 321.

PG54897.B00731
Sounds, musical, illustrative of the analysis of phenomena, 85. Means of having a knowledge of, 89. Propagation of, through the air, 246. Newton’s analysis of, 247.

PG54897.B00732
Standard measurement, necessity of, 125. Laws of nature used as such, illustrated by the rotation of the earth, 126.

PG54897.B00733
Substances all subject to dilatation by the addition of heat, 243.

PG54897.B00734
Sun, the character of the heat of, 315.

PG54897.B00735
Thales, philosophy of, 107.

PG54897.B00736
Theories, how to estimate the value of, 204. Best arrived at by the consideration of general laws, 208. Explanatory of the phenomena of nature; on what their application ought to be grounded, 209.

PG54897.B00737
Thomson, Dr., his opinion of the atomic weights, 307.

PG54897.B00738
Thermometer, air, 319.

PG54897.B00739
Thermo-electricity, 341.

PG54897.B00740
Time, division of, 126, 127.

PG54897.B00741
Torricelli, pupil of Galileo, his experiments proving the weight of atmosphere, 229.

PG54897.B00742
Torpedo, shock of, 341, 342.

PG54897.B00743
Ulugh Begh, his catalogue of stars, 277.

PG54897.B00744
Vaccination, success of, as a preventive to small-pox, 52.

PG54897.B00745
Vision and light, ignorance of the ancients respecting, 249.

PG54897.B00746
Volta, his discoveries in electricity, 335. Electric pile of, 337.

PG54897.B00747
Voltaic circuit, 338.

PG54897.B00748
Water, effects of the power of, 61.

PG54897.B00749
Whewell, his experiments, 187.

PG54897.B00750
Wells, Dr., his theory of dew, 163.

PG54897.B00751
Wind, effects of the power of, 61.

PG54897.B00752
Wire steel, magnetized masks of, used by needle-makers, 57.

PG54897.B00753
Wollaston, Dr., his verification of the laws of double refraction in Iceland spar, 258. His invention of the goniometer, 292.

PG54897.B00754
World, the materials of the, 290.

PG54897.B00755
Young, Dr., his experiments on the interference of the rays of light, 260.

PG54897.B00756
Zoology, fossil, 344.

PG54897.B00757
THE END.

PG54897.B00758
LONDON PRINTED BY SPOTTISWOODE AND CO. NEW-STREET SQUARE.

PG54897.B00759
FOOTNOTES

PG54897.B00760
[1] Hooke’s Posthumous Works. Lond. 1705.--p. 472 and p. 458.

PG54897.B00761
[2] Wealth of Nations, book i. chap. i. p. 15.

PG54897.B00762
[3] On this subject, we cannot forbear citing a passage from one of the most profound but at the same time popular writers of our time, on a subject unconnected it is true with our own, but bearing strongly on the point before us. “But, if science be manifestly incomplete, and yet of the highest importance, it would surely be most unwise to restrain enquiry, conducted on just principles, even where the immediate practical utility of it was not visible. In mathematics, chemistry, and every branch of natural philosophy, how many are the enquiries necessary for their improvement and completion, which, taken separately, do not appear to lead to any specifically advantageous purpose! how many useful inventions, and how much valuable and improving knowledge, would have been lost, if a rational curiosity, and a mere love of information, had not generally been allowed to be a sufficient motive for the search after truth!”--Malthus’s Principles of Political Economy, p. 16.

PG54897.B00763
[4] Λογος, _ratio_, reason.

PG54897.B00764
[5] Λογος, _verbum_, a word.

PG54897.B00765
[6] It were much to be wished that navigators would be more cautious in laying themselves open to a similar censure. On looking hastily over a map of the world we see three Melville Islands, two King George’s Sounds, and Cape Blancos innumerable.

PG54897.B00766
[7] Young. Lectures on Nat. Phil. ii. 627. See also Phil. Trans. 1801-2.

PG54897.B00767
[8] Captain Basil Hall, R. N.

PG54897.B00768
[9] We must caution our readers who would assure themselves of it by trial, that it is an experiment of some delicacy, and not to be made without several precautions to ensure success. For these we must refer to our original authority (Fresnel. Mémoire sur la Diffraction de la Lumiere, p. 124.); and the principles on which they depend will of course be detailed in that volume of the Cabinet Cyclopædia which is devoted to the subject of LIGHT.

PG54897.B00769
[10] Little reels used in cotton mills to twist the thread.

PG54897.B00770
[11] Such a block would weigh between four and five hundred thousand pounds. See Dr. Kennedy’s “Account of the Erection of a Granite Obelisk of a Single Stone about Seventy Feet high, at Seringapatam.”--_Ed. Phil. Trans._ vol. ix, p. 312.

PG54897.B00771
[12] Dr. Coindet of Geneva.

PG54897.B00772
[13] Journal of a Voyage to the South Seas, &c. &c. under the Command of Commodore George Anson, in 1740-1744, by Pascoe Thomas, Lond. 1745, So tremendous were the ravages of scurvy, that, in the year 1726, admiral Hosier sailed with seven ships of the line to the West Indies, and buried his ships’ companies twice, and died himself in consequence of a broken heart. Dr. Johnson, in the year 1778, could describe a sea-life in such terms as these:--“As to the sailor, when you look down from the quarter deck to the space below, you see the utmost extremity of human misery, such crowding, such filth, such stench!”--“A ship is a prison with the chance of being drowned--it is worse--worse in every respect--worse room, worse air, worse food--worse company!” Smollet, who had personal experience of the horrors of a seafaring life in those days, gives a lively picture of them in his Roderick Random.

PG54897.B00773
[14] Lemon juice was known to be a remedy for scurvy far superior to all others 200 years ago, as appears by the writings of Woodall. His work is entitled “The Surgeon’s Mate, or Military and Domestic Medicine. By John Woodall, Master in Surgery London, 1636,” p. 165. In 1600, Commodore Lancaster sailed from England with three other ships for the Cape of Good Hope, on the 2d of April, and arrived in Saldanha Bay on the 1st of August, the commodore’s own ship being in perfect health, from the administration of three table-spoonsfull of lemon juice every morning to each of his men, whereas the other ships were so sickly as to be unmanageable for want of hands, and the commander was obliged to send men on board to take in their sails and hoist out their boats. (Purchas’s Pilgrim, vol. i. p. 149.) A Fellow of the college, and an eminent practitioner, in 1753 published a tract on sea scurvy, in which he adverts to the superior virtue of this medicine; and Mr. A. Baird, surgeon of the Hector sloop of war, states, that from what he had seen of its effects on board of that ship, he “thinks he shall not be accused of presumption in pronouncing it, if properly administered, a _most infallible remedy_, both in the cure and prevention of scurvy.” (Vide Trotter’s Medicina Nautica.) The precautions adopted by captain Cook in his celebrated voyages, had fully demonstrated by their complete success the practicability of keeping scurvy under in the longest voyages, but a uniform system of prevention throughout the service was still deficient.

PG54897.B00774
It is to the representations of Dr. Blair and sir Gilbert Blane, in their capacity of commissioners of the board for sick and wounded seamen, in 1795, we believe, that its _systematic introduction into nautical diet_, by a general order of the admiralty, is owing. The effect of this wise measure (taken, of course, in conjunction with the general causes of improved health,) may be estimated from the following facts:--In 1780, the number of cases of scurvy received into Haslar hospital was 1457; in 1806 _one_ only, and in 1807 _one_. There are now many surgeons in the navy who have never seen the disease.

PG54897.B00775
[15] Throughout France the conductor is recognised as a most valuable and useful instrument; and in those parts of Germany where thunder-storms are still more common and tremendous they are become nearly universal. In Munich there is hardly a modern house unprovided with them, and of a much better construction than ours--several copper wires twisted into a rope.

PG54897.B00776
[16] We have been informed by an eminent physician in Rome, (Dr. Morichini) that a vast quantity of the sulphate of quinine is manufactured there and consumed in the Campagna, with an evident effect in mitigating the severity of the malarious complaints which affect its inhabitants.

PG54897.B00777
[17] Dr. Johnson, Memoirs of the Medical Society, vol. v.

PG54897.B00778
[18] The engine at Huel Towan. See Mr. Henwood’s Statement “of the performance of steam-engines in Cornwall for April, May, and June, 1829.” Brewster’s Journal, Oct. 1829.--The _highest_ monthly average of this engine extends to 79 millions of pounds.

PG54897.B00779
[19] However, this is not quite a fair statement; a man’s daily labour is about 4 lbs. of coals. The extreme toil of this ascent arises from other obvious causes than the mere height.

PG54897.B00780
[20] Its surface is about 40,000 acres, and medium depth about 20 feet. It was proposed to drain it by running embankments across it, and thus cutting it up into more manageable portions to be drained by windmills.

PG54897.B00781
[21] No one doubts the _practicability_ of the undertaking. Eight or nine thousand chaldrons of coals duly burnt would evacuate the whole contents. But many doubt whether it would be profitable, and some, considering that a few hundreds of fishermen who gain their livelihood on its waters would be dispossessed, deny that it would be _desirable_.

PG54897.B00782
[22] “Experiments to determine the Force of fired Gunpowder.” Phil. Trans. vol. lxxxvii. p. 254. et seq.

PG54897.B00783
[23] See a very ingenious application of this kind in Mr. Babbage’s article on Diving in the Encyc. Metrop.--Others will readily suggest themselves. For instance, the ballast in reserve of a balloon might consist of materials capable of evolving great quantities of hydrogen gas in proportion to their weight, should such be found.

PG54897.B00784
[24] The sulphuric. Bracconot, Annales de Chimie, vol. xii. p. 184.

PG54897.B00785
[25] D’Arcet, Annales de l’Industrie, Fevrier, 1829.

PG54897.B00786
[26] See Dr. Prout’s account of the experiments of professor Autenrieth of Tubingen. Phil. Trans. 1827, p. 381. This discovery, which renders famine next to _impossible_, deserves a higher degree of celebrity than it has obtained.

PG54897.B00787
[27] Greenwich.

PG54897.B00788
[28] Maskelyne’s.

PG54897.B00789
[29] Thomson’s First Principles of Chemistry, vol. ii. p. 68.

PG54897.B00790
[30] Galileo exposes unsparingly the Aristotelian style of reasoning. The reader may take the following from him as a specimen of its quality. The object is to prove the immutability and incorruptibility of the heavens; and thus it is done:--

PG54897.B00791
I. Mutation is either generation or corruption.

PG54897.B00792
II. Generation and corruption only happen between contraries.

PG54897.B00793
III. The motions of contraries are contrary.

PG54897.B00794
IV. The celestial motions are circular.

PG54897.B00795
V. Circular motions have no contraries.

PG54897.B00796
α. Because there can be but three simple motions. 1. To a centre. 2. Round a centre. 3. From a centre.

PG54897.B00797
β. Of three things, one only can be contrary to one.

PG54897.B00798
γ. But a motion to a centre is manifestly the contrary to a motion from a centre.

PG54897.B00799
δ. Therefore a motion _round_ a centre (_i. e._ a circular motion) remains without a contrary.

PG54897.B00800
VI. _Therefore_ celestial motions have no contraries--_therefore_ among celestial _things_ there are no contraries--_therefore_ the heavens are eternal, immutable, incorruptible, and so forth.

PG54897.B00801
It is evident that all this string of nonsense depends on the excessive vagueness of the notions of generation, corruption, contrariety, &c. on which the changes are rung.--_See_ GALILEO, _Systema Cosmicum_, Dial. i. p. 30.

PG54897.B00802
[31] Macquer justly observes, that the alchemists would have rendered essential service to chemistry had they only related their unsuccessful experiments as clearly as they have obscurely related those which they pretend to have been successful.--_Macquer’s Dictionary of Chemistry_, i. x.

PG54897.B00803
[32] Paracelsus performed most of these cures by mercury and opium, the use of which latter drug he had learned in Turkey. Of mercurial preparations the physicians of his time were ignorant, and of opium they were afraid, as being “cold in the fourth degree.” Tartar was likewise a great favourite of Paracelsus, who imposed on it that name, “because it contains the water, the salt, the oil, and the acid, which burn the patient as hell does:” in short, a kind of counterbalance to his opium.

PG54897.B00804
[33] See the Life of Galileo Galilei, by Mr. Drinkwater, with Illustrations of the Advancement of Experimental Philosophy.

PG54897.B00805
[34] The temporary star in Cassiopeia observed by Cornelius Gemma, in 1572, was so bright as to be seen at noon-day. That in Serpentarius, first seen by Kepler in 1604, exceeded in brilliancy all the other stars and planets.

PG54897.B00806
[35] Edinburgh Phil. Journ. 1819, vol. i. p. 8.

PG54897.B00807
[36] The abstract principle of repetition in matters of measurement (viz. juxta-position of units without error) is applicable to a great variety of cases in which quantities are required to be determined to minute nicety. In chemistry, in determining the standard atomic weights of bodies, it seems easily and completely applicable, by a process which will suggest itself at once to every chemist, and seems the only thing wanting to place the exactness of chemical determinations on a par with astronomical measurements.

PG54897.B00808
[37] Accurate and _perfectly_ authentic copies of the yard and pound, executed in platina, and hermetically sealed in glass, should be deposited deep in the interior of the massive stone-work of some great public building, whence they could only be rescued with a degree of difficulty sufficient to preclude their being disturbed unless on some very high and urgent occasion. The fact should be publicly recorded, and its memory preserved by an inscription. Indeed, how much valuable and useful information of the actual existing state of arts and knowledge at any period might be transmitted to posterity in a distinct, tangible, and imperishable form, if, instead of the absurd and useless deposition of a few coins and medals under the foundations of buildings, specimens of ingenious implements or condensed statements of scientific truths, or processes in arts and manufactures, were substituted. Will books infallibly preserve to a remote posterity all that we may desire should be hereafter known of ourselves and our discoveries, or all that posterity would wish to know? and may not a useless ceremony be thus transformed into an act of enrolment in a perpetual archive of what we most prize, and acknowledge to be most valuable?

PG54897.B00809
[38] In the system alluded to, the name of quartz is assigned to iolite and obsidian; that of mica to plumbago, chlorite, and uranite; sulphur, to orpiment and realgar, &c. See Mohs’s System of Mineralogy, translated by Haidinger.
