A Syllabus of a Course of Lectures on Mineralogy by John Stevens Henslow

By John Stevens Henslow

John Stevens Henslow (1796-1861), a pupil of Adam Sedgwick, turned Professor of Mineralogy at Cambridge in 1822. He quickly moved to a chair in Botany, and have become a instructor and mentor to Charles Darwin. This publication on mineralogy was once first released in 1823. It was once meant to save lots of time in school by means of supplying an simply obtainable connection with the composition of varied minerals in keeping with the rules of atomic idea, which used to be then coming into the clinical mainstream. In that paradigm, research and exam of any mineral's composition concerned first ascertaining the mineral's user-friendly molecules, either 'essential' and 'accidental', and moment, picking out the proportions within which the fundamental elements mixed to shape the integrant molecule of the mineral. Henslow's booklet will curiosity historians of technology tracing the advance of atomic thought, and people operating extra largely within the historical past of college schooling and the highbrow weather of the 19th century.

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Triangular prisms. 3. Parallelopipeds. III. EXTERNAL CHARACTERS . Regular crystals — their form supposed to be independent of the relative magnitude of their faces—method of determining their form by the common goniometer—reflecting goniometer. Hemitrope crystals. Indeterminate crystallization—ex. gr. lenticular —acicular—striated—fibrous. Concretions—stalactites and stalagmites — incrustations—petrefactions—pseudomorphous crystals—amorphous masses. IV. PHYSICAL CHARACTERS. Specific gravity) = , "eifht * J ° ^ ) ( estimated bv w1' lost in water j J the common scales—Hydrostatic balance—Nicholsqn's balance.

In. Crystals 40. Amorphous—pseudomorphous. iv. G. 8. vi. White Iron pyrites. Hatchet Iron Sulphur Theory. 18 + Arsenical Iron pyrites—Auriferous. LECTURES ON MINERALOGY. 17 Species 6. Sulphate of Iron—Green vitriol. Berg. Theory. i. 6 + 4 II. Prim. Acute rhomboid P. P. = 81° 23'. in. Crystals 7—fibrous—pulverulent — amorphous —stalactitic. Species 7. Carbonate of Iron—Spathose Iron —Brown Spar. Bert. Theory. Bayen Theory. Protox. Iron 57. 57. 6 1 Carb. Acid 35. 8 + 34 34. 1 Manganese... 5 &c. Magnesia .

I r o n . . 9 + Chrom. 0 + Vauq. Laog. Klap. 7 34. 43. 53. 2. 1. 3 11. 1. 7 34. 43. 5 2. 6. 3 II. Prim. Regular octohedron. in. —granular—amorphous. iv. G. = 4 . 0 3 . 20 A SYLLABUS OF Species 13. Tungstateof Berzel. Elhny. —Wolfram. Vauq. Klap. 2 i. Ox. 5 18. 9 Tung. Acid.... 77 65. 37. 22. 25 2. 5 18 JJTheory. Tune. 06 45. 60 ii. Prim. Right rectangular prism, in. —Amorphous, iv. G. 3. GENUS VIII. NICKEL. S. G. 93. Plates 4 inch thickMagnetic power of Nickel : Iron :: 1 : 4 nearlyor as 35 : 55 (Lampadius).

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