INDEX. 



Absorption, power of, in Boils, for food 

 of plants, 75 



in charcoal, for colouring matter 



and gases is a surface attraction, 76 



in soils, is accompanied by chem- 

 ical decomposition, 79 



for compounds of soda, and for 



silicic acid, 88, 137 



varies in each soil, 137 



for potash, 136 



for silicic acid and ammonia, 138 



is inversely as the diffusibility 



of food, 137 



shows the depth to which food 



penetrates, 215 



in turf, 112 



by roots of plants not osmotic, 63 

 : value of knowledge of to 



agriculturists, 217 



of nutriment by roots of plants, 94 



of silicic acid, influence of organic 

 matter on the, 89 



number of soils, meaning of, 139 

 for ammonia, potash, phos- 

 phate of lime, and phosphate of mag- 

 nesia and ammonia, 139 



importance of, to agricultu- 

 rists, 141 



Agriculture, progress of, impossible if 

 dependent on a supply of ammonia, 

 304 



in Europe still young, 233 

 Agricultural produce, the permanence 



of, regulated by a law of nature, 232 

 Agrostemma cithago, ash of, 226 

 Ahrend's examination of the oat plant at 



different stages of growth, 49 

 Aloe, food of, stored in leaves, 41 

 Alumina in club moss, 71 

 Ammonia, absorbed by different soils, 138 



absorption, number of, 138 



absorbed strongly in soils, rich in 

 humus, 143 



action of the salts of, by them- 

 selves and in guano, 247, 281, 287 



action of salts of, on earthy phos- 

 phates, silicates, &c., 88 



Ammonia, amount of in rain and dew, 274 



always present in air, 275 



calculation of amount of, that would 

 be required in Europe, 305 



compounds of, by themselves not im- 

 portant, 301 



cost of, precludes its extensive use, 

 305 



comportment of, with arable soil, 137 



diffusibility in soils, 88 



in drain water, 98 



in lysimeter waters, 99 



in spring and river water, 103 



salts of,~as food and as means of dis- 

 tributing food in soils, 134, 138 



in farm-yard manure and soils not 

 separable by distillation with alkalies, 

 295, 298 



In manures compared with corn pro- 

 duced, according to Lawes, 304 



manufactured too limited in quantity 

 to be trusted to, 305 



use of, limited by its price, 307 



nitrite of, formed by oxidation, 307 



loss of, in lime soils, by oxidation, 311 



theory, 281, 292 



Ammoniacal compounds, experiments 

 with, by Schattenmann, 282 



by Lawes and Gilbert, 283 



by Kuhlmann, 288, 317 



and with guano by the Ba- 

 varian Agricultural Society, 285, 817 

 Anderson on the growth of turnips, 84 

 Annual plant, growth of, 29, 43, 46 

 Anthemis arvensis, ash, analysis of, 226 

 Appendix A, analysis of birch leaves, 

 332 



B, on the starch in the stems of 

 palms, 335 



C, Hale' s vegetable statics, 336 



D, analysis of drainage, lysimeter, 

 river, and marsh waters, 341 



E, growth of plants in solutions of 

 their food, 260 



F, on the growth of beans in powdered 

 turf, 360 



G, on Japanese husbandry, 361 



H, on mineral matters supplied by 

 irrigation, 374 



