INDEX. 



A. 



Absorption, by roots, 37 Of salts, 39. 



Acid, acetic, emitted by plants, 51 transforma- 

 tion of, 92 formation of, 100, 102 Boracic, 

 42 Carbonic, 10 contained in the atmo- 

 sphere, 11 decomposed by plants, 16 from 

 respiration, 16 why necessary to plants, 36 

 Cyanic, transformation of, 94 Formic, 25, 

 26, 88 Hippuric, 33 Humic, 12 proper- 

 ties of, 13 Hydrocyanic, 25, 88 Kinic, 39 

 Lactic, 64 production of, 98 Meconic, 39 

 Melanic, 99 Nitric, source of, 32 Phosphoric, 

 in ashes of plants, 53 Rocellic, in plants, 37 

 Succinic, 112 Sulphuric, action of, on soils, 

 70, 84 Tartaric, in grapes, 37. 



Acids, action of upon sugar, 92 Arrest decay, 

 1 1 1 Capacity for saturation, 36 Organic, in 

 plants, 11, 36 when formed, 18. 



Affinity, action of, 25 Chemical, examples of, 

 88 Weak, example of, 88. 



Agave Americana, absorbs oxygen, 18. 



Agriculture, in China, 65 Object of, 34, 49, 57 

 how attained, 49 Its importance, 49 A 

 principle in, 63. 



Air, access of, favoured, 27 Ammonia in, 11, 32 

 Carbonic acid in, 15 Effect of upon juices, 

 100 on soils, 56 Improved by plants, 17 

 Necessary to plants, 44. 



Albumen, 33. 



Alcohol, effect of heat on, 93 Exhaled, 25 

 Products of its oxidation, 99 From sugar, 95. 



Aldehyde, 99. 



Alkalies, from granitic soils, 40 Presence of, in- 

 dicated, 72 Promote decay in wood, 111 

 Quantity in aluminous minerals, 50. 



Alkaline bases, in plants, on what their existence 

 depends, 38 Salts in plants, sources of, 51 

 contained in fertile soils, 52. 



Alloxan, 108. 



Alloxantin, 108. 



Alumina, in fertile soils, 49 Its influence on 

 vegetation, 49. 



Amber, origin of, 112. 



Ammonia, carbonate of, from wine, 64 how fixed, 

 64 Cause of nitrification, 103 Changes co- 

 lours, 30 Condensed by charcoal, 35 Con- 

 version of, into nitric acid, 103 Early exist- 

 ence of, 42 Fixed by gypsum, 64 From 

 animals, 58 Contained in beet-root, &c., 32 

 maple juice, 33 stables, &c., 64 Fur- 

 nishes nitrogen, 36 Loss from evaporation, 

 34 Produced by animal organism, 42 Pro- 

 duct of decay, 30 disease, 129 Properties 

 of, 31 Quantity absorbed by charcoal, 35 

 by decayed wood, 35 In rain-water, 31 Se- 

 parated from soils by rain, 35 In snow water, 

 32 Solubility of, 31 Transformation of, 30. 



Amylin, its effect, 26. 



Analysis of decayed wood, 111 Of fire-damp, 

 115 Of guano, 67 Of lentils, 54 Of oak- 



wood, 110 Of night-soil, 60 Of salt waU 

 43 Of soils, 73 113 Of wood coal, 1U 



Animal food, preservation of, 101 Life, con- 

 nexion of, with plants, 9 Bodies, products of 

 decay, 30. 



Animals, excrements of, 18, 63. 



Annual plants, how nourished, 46. 



Anthoxanthum odoratum, acid in, 33. 



Anthracite, 115. 



Antidotes to poisons, 118. 



Apatite, 53. 



Arable land, 50. 



Aromatics, their influence on fermentation, ! 05. 



Argillaceous earth, its origin, 50. 



Arragonite, transformation of, 90. 



Argenious acid, action of, 118. 



Ashes, as manure, 67 Comparative value of, 61 

 Of fire-wood, 38 Of pine trees, 37 Of 

 plants, origin of salt in, 43 Importance of ex- 

 amination of, 38 Of wheat, 53 used as a 

 manure, 72 Of bones, 62 Of peat, 62 Of 

 coals, 67. 



Assimilation, of carbon, 12, 23 Of carbonic acid, 

 and ammonia, 45 Of hydrogen, 28, 29 Of 

 nitrogen, 30, 36 Its power, 48. 



Atmosphere, ammonia in, 11, 32 Composition 

 of, 11 How maintained, 16 Composition is 

 invariable, 15 Carbonic acid in the, 11 Mo- 

 tion of, 17. 



Atoms, motions of 89 Permanence in position 

 of, 89. 



Attraction, powerful, overcome, 94. 



Azotised matter in juices of plants, 47 Sub- 

 stances, combustion of, 102. 



B. 



Bamboo, silica in, 58. 



Bark of trees, products in, 18. 



Barley, analysis of, 53. 



Barruel, his experiments on the blood, 125. 



Base, what, 36. 



Bases, alkaline, in plants, on what their existence 

 depends, 38 Organic, 11 Oxygen contained 

 in, 36 In plants, 37 Substitution of, 37. 



Beans, alkalies in, 54 Nutritive power of, 54 



Becquerrel, experiments of, 51. 



Beech, ashes of, 30. 



Beer, 107 109 Bavarian, 107 Varieties of. 

 106. 



Beet-root sugar, 14 Ammonia from, 32 From 

 sandy soils, 47. 



Benignant disease, 126. 



Benzoic acid, formed, 33. 



Birch tree, ammonia from, 33. 



Blood, its office, 46 Action of chemical agents 

 upon, 123 Its feeble resistance to exterior in- 

 fluences, 123 Organic salts in, 116- Its cha- 

 racter, 120. 



Blossoms, when produced, 24 Increased, 45- 

 Removal of, from potatoes, 46. 



