134 



INDEX. 



Application of substances containing it, 34 

 Assimilation of, 30-36 Chloride of, 88 

 Compounds of, 11 peculiarity in 97 In ex- 

 crements, 63 From the atmosphere, 30 In 

 plants, 11 Production of, the object of agri- 

 culture, 34 Transformation of bodies con- 

 taining, 93 In rice, 33 In solid excrements, 

 63 In urine, 64. 



Nutrition, conditions essential to, 21 Inorganic 

 substances required in, 21 Superfluous, how 

 employed, 24 Of young plants, 58. 



0. 



Oaks, ashes of, 52 Excretions of, 18 Dwarf, 23. 



Oak-wood affords humic acid, 13 Composition 

 of, 110 Mouldered, analysis of, 111. 



Ddour of substances, 106 Of gaseous contagious 

 matter, 127. 



(Enanthic ether, 105. 



Organs of excretion, 25. 



Organic acids, 11 Decomposition of, 49 Che- 

 mistry, 9 Compounds, 29 Compared with 

 inorganic salts in plants> 91. 



Organised bodies do not generate substances, 24. 



Oxamide, decomposition of, 121. 



Oxides, metallic, in fir-wood, 38. 



Oxygen, action on alcohol, 99 Absorption of, at 

 night, 18 by leaves, 18 respiration, 25 

 plants, 18 wood, 110- Action upon woody 

 fibre, 111 Its action in decomposition, 101 

 Emitted by leaves, 15 Given to air by land, 

 28 Extracted from air by mould, 112 In air, 

 11 Consumption of, 15 In water, 28 Pro- 

 motes decay, 44 Separated during the forma- 

 tion of acids, 29 Is furnished by the decom- 

 position of water, 28. 



P. 



Perennial plants, how nourished, 46. 



Peroxide of hydrogen, 63. 



Petersen and Schodler, their analysis of woods, 19. 



Phosphates necessary to plants, 53. 



Phosphate of iron, the probable cause of rust, 75. 



Phosphoric acid in ashes of plants, 53 Source 

 of, 53. 



Physiologists, their experiments not satisfactory, 

 22 Neglect of chemistry by, 20. 



Pipe-clay, ammonia in, 35. 



Plants absorb oxygen, 18 Ashes of, salts in, 37 

 Conditions necessary for their life, 22 De- 

 cay of, a source of oxygen, 29 Decompose 

 carbonic acid, 16 Developement of, requisites 

 for, 11, 40, 46, 48 Effect of, on rocks, 51 

 Elements of, 10 Emit acetic acid, 51 Exha- 

 lation of carbonic acid from, 19 Of a former 

 world, 27 Formation of their components, 

 29 Functions of, 16 Improve the air, 17 

 Influence of gases on, 18 of shade, 18 In- 

 organic constituents of, 36 Life of, connected 

 with that of animals, 9 Milky-juiced, in bar- 

 ren soils, 27 Organic acids in, 11, 36 salts 

 in, 37 Perennial, nourished, 46 Products of, 

 vary, 47 Size of, proportioned to organs of 

 nourishment, 24 Succession of, its advantage, 

 55 Vital processes of, 29 Wild, obtain 

 nitrogen from the air, 34 Yield oxygen, 17. 



Platinum does not decompose nitric acid, 88. 



Ploughing, its use, 44. 



Poisons generated by disease, 115 Inorganic, 

 117 Peculiar class of, 119- Rendered inert 

 by heat, 121. 



Poisoning, superficial, 118 By sausages, 120. 



Pompeii, air from, 15 Bones from, 53. 



Potash, action of, upon mould, 112 In grapes, 

 38 Ley of, its effects on excrements, 34 

 Presence of, in plants, accounted for, 50 Re- 

 placed by soda, 38 Required by plants, 22 

 Quantity in soils, 50 Silicate of, in soils, 22 

 Sources of, 50. 



Potatoes, oil of, 104 Effect of, as food, 47 Ger- 

 mination of, 45 Produce of, increased, 45. 



Products of transformations, 25. 



Pus, globules in, 124. 



Purgative effect of salts explained, 117. 



Pusey, Mr., on nitrate of soda, 69. 



Putrefaction, 23, 90 Of animals, 59 Commu- 

 nicated, 121. 



Putrefaction, source of ammonia, 30 of carbonic 

 acid, 34. 



Putrefying sausages, death from, 120 their mode 

 of action, 120 Substances, their effect on 

 wounds, 121 alkaline, 123 acid, 123. 



R. 



Rain-water, alkali extracted by, 51. 



Reduction of oxides, 89. 



Reeds and canes require silica, 53. 



Removal of branches, effects of, 45 



Reservoirs of dung, 64. 



Rhine, soils in its vicinity, 57 Wines, 105. 



Ripening of fruit, 45. 



Root secretions, 55. 



Roots absorb, 36 Emit extractive matter, 55 



Their office, 43. 

 Rotation of crops, 54-59. 



S. 



Saliculite of potash, 99. 



Saline plants, 40. 



Salsola kali, 38. 



Salt, volatilisation of, 43. 



Salts, absorption of, 39 Effect of, on the or* 

 ganism, 116 Effect of, on flesh, 116 on th 

 stomach, 116 Organic, in plants, 11 in the 

 blood, 116 Passage of, through the lungs, 116. 



Salt-works, loss in, 42. 



Saltwort, 41. 



Sand, plants in, 27. 



Sandy soil, decay of wood in, 111. 



Saturation, capacity of, 36. 



Sausages, poisonous, 120. 



Saussure, his experiments on air, 15 On the 

 growth of plants, 53. 



Schubler, his observations on rain, 31. 



Sea-water, analysis of, 42 Contains carbon, l(i 

 Contains ammonia, 42. 



Silica in grasses, 53 In reeds and canes, 53. 



Silicate of potash in plants, 22 As a manure, 

 63, 72. 



Silver, carbonate of, action on organic acids, 89 

 Salts, poisonous effects of, 118. 



Sinapis alba, 128. 



Size of plants proportional to organs of nourish- 

 ment, 24. 



Smell, what, 106. 



Snow-water, ammonia in, 32. 



Soda may replace potash, 38. 



Soils, advantage of loosening, 53, 70 Analysis 

 of, 70 Best for meadow-land, 40 Carbon 

 restored to, 26 Chemical nature of its influ- 

 ence, 57 Constituents of, 70-84- -Exhaustion 

 of, 51 Ferruginous, improved, 44 Fertile, 



