INDEX. 



397 



G. 

 Gaseous substances in the lungs, 



effect of, 384 

 Gasterosteus aculeatus, in salt- 

 pans, 77 

 Gay-Lussac, his experiments, 327 

 Germination of potatoes, 99 



Of grain, 102 

 Glue, manure from, 179 

 Gluten, conversion of, into yeast, 

 322 



Decomposition of, 294 



Gas from, 311 

 Grain, germination of, 102 

 Grapes, fermentation of, 311 



Juice of, differences in, 118 



Potash in, 70 

 Grauwacke, soil from, 113 

 Guano, 4S, 161, 174, 258-262 

 Gypsum, experiment with, 53 



Decomposed by carbonate of 

 ammonia, 182 



Decomposed by salt, 63 



Its influence, 53 



Use of, l'S2 



H. 

 Hanover tobacco, 238 

 Havannah tobacco, analysis of its 



ashes, 238 

 Hay, analysis of ashes, 150, 236 



Carbon in, 11 

 Hessian and English weights and 



measures, 392 

 Horse, urine of the, 169, 257, 258 



Concretions in the, 119 

 Horse-dung, analysis of, 169, 231, 



237 

 Humate of lime, quantity received 



by plants, 9 

 Humic acid, 5 



Sometimes contains ammonia, 6 

 Action of, 93 

 Properties of, 5 

 Is not contained in soils, 7 

 Quantity received by plants, 9 

 Insolubility of, 93 

 Humus, 5 



Action of, 93 

 Analysis of, 6 

 Erroneous opinions concerning, 



7 

 Action upon oxygen, 92, 93 

 Coal of, 5 



Humus — continued. 



Conversion of woody fibre into, 

 338 



How produced, 5 



Its insolubility, 93 



Properties of, 5 



Sources of carbonic acid, 93 



Theory of its action, 93 

 Hybernating animals, 100 

 Hydrogen, assimilation of, 35-39 



Excess of in wood accounted 

 for, 36 



Of decayed wood, 340-342 



Of plants, source of, 36 



Peroxide of, 270 

 Hyett, Mr. , on nitrate of soda, 223 



Ice, bubbles of gas in, 26 

 lNGENHouss,.his experiments, 21 

 Ingredients of soil removed by 



crops, 148 

 Inorganic constituents of plants, 



64-81 



L. 

 Lava, soil from, 110 

 Lead, salts of, compounds with or- 

 ganic matter, 360 

 Leaves, absorb carbonic acid, 16 

 Ashes of, contain alkalies, 81 

 Leaves of pine and fir — 



Cessation of their functions, 32 

 Change color from absorption of 



oxygen, 38 

 Decompose carbonic acid, 16 

 Their office, r€ 



Power of absorbing nutriment, 

 how increased, 30 

 Life, notion, of, 369 

 Light, absence oi\ its effect, 22 

 Chemical effects of, 105 

 Influences decomposition of car- 

 bonic acid, 105 

 Lime, phosphate of, 176-178 

 Lime, action of, 12S-131 

 Lime-plants, 150 

 Lime-tree yields sugar, 103 

 Limestones, hydraulic, 91, 92, 130 



M. 

 Magnesia, phosphate of, in 



64, 65 

 Manure, 165-187 



