INDEX. 



ABSORPTION, power of, in soils, for 

 food of plants, 65 



in charcoal, for colouring mat- 

 ter and gases is a surface attraction, 65 



in soils, is accompanied by- 

 chemical decomposition, 69 



for compounds of soda, and 



for silicic acid, 80, 135 



varies in each soil, 134 



for potash, 134 



for silicic acid and ammonia, 



135 



is inversely as the diffusibility 



of food, 134 



shows the depth to which food 



penetrates, 223 



in turf, 107 



— by roots of plants not osmotic, 51 

 value of knowledge of to 



agriculturists, 225 



— of nutriment by roots of plants, 86 



— of silicic acid, influence of organic 

 matter on the, 80 



— number of soils, moaning of, 136 



— — — — for ammonia, potash, 

 phosphate of lime, and phosphate of 

 magnesia and ammonia, 136 



— — — — importance of, to agri- 

 culturists, 138 



Agriculture, progress of, impossible if 

 dependent on a supply of ammonia, 

 322 



— in Europe still young, 243 

 Agricultural produce, the permanence 



of, rcgidated by a law of nature, 243 

 Agrostemma cithago, ash of, 235 

 Ahrend's examination of the oat plant 



at different stages of growth, 35 

 Aloe, food of, stored in leaves, 26 

 Alumina in club-moss, 60 

 Ammonia, absorbed by different soils, 



135 



— absorption, number of, 1 36 



— absorbed strongly in soils, rich in 

 hiimus, 141 



APP 



Ammonia, action of the salts of, by 

 themselves and in guano, 258, 296, 303 



— action of salts of, on earthy phos- 

 phates, silicates, &c., 79 



— amount of in rain and dew, 289 



— always present in air, 290 



— ealeiilation of amount of, that would 

 be required in Europe, 323 



— compomids of, by themselves not im- 

 portant, 319 



— cost of, precludes its extensive use, 

 325 



— comportment of, with arable soil, 135 



— diffusibility in soils, 79 



— in drain water, 91 



— in lysimeter waters, 92 



— in spring and river water, 96 



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

 tributing food in soUs, 131, 335 



— in fai-m-yard manure and soils not 

 separable by distillation with alkalies, 

 312, 315 



— in manures compared -with corn pro- 

 duced, according to Lawes, 322 



— manufactured too limited in quan- 

 tity to be trusted to, 323 



— use of, limited by its price, 325 



— nitrite of, formed by oxidation, 326 



— loss of, in lime soils, by oxidation, 

 330 



— theory, 296, 309 



Ammoniacal compounds, experiments 



with, by Schattenmann, 297 



by Lawes and Gilbert, 298 



by Kuhlmann, 336, 304 



and with guano, by the 



Bavarian Agricultural Society,301, 336 

 Anderson on the growth of turnips, 18 

 Annual plant, growth of, 13, 28, 32 

 Anthemis arvensis, ash, analysis of, 235 

 Appendix A, analysis of birch leaves, 



353 



— B, on the starch in the sterna of 

 palms, 356 



— C, Hale's vegetable statics, 357 



