INDEX 



Absolute zero of temperature, 26 

 Acid, definition of, 7 

 Acids, organic, in plants, 91 

 Air, changes in, by respiration, 156 



chemical composition of, 27 



effect of, on rocks, 39 



physical properties of, 24 



suspended matter in, 32 



weight of, 24 

 Albite, 34 



Albumin in milk, 185 

 Albuminoid ammonia in water, 67 



ratio of foods, 171 

 AlbuminoidSjChemical nature of, 93 



of milk, 182 



formation of, in plants, 81 

 Alinit, 56 

 Alkali, " black," 69 



definition of, 7 



soils, 67, 69 



tolerance of plants to, 70 



"white," 69 

 Alkaloids, 95 

 Allotropic forms, 15 

 Amides, 94 

 Amino-acids, 94 

 Ammonia, in the air, 29 



in rain water, 30 

 Ammonium sulphate, 108 

 Amylopsin, 160 

 Anaerobic organisms, 56 

 Analysis of manures, 116 



Analysis of soils, 59 

 Aneroid barometer, 26 

 Animals, action of, on soils, 40 



composition of bodies of« 151 

 Antiseptics, 211, 215 



in milk, 198 

 Ants, action of, in soil formation, 

 40 



destruction of, 222 

 Apples, 138 

 Argon, 6 



in the atmosphere, 28 

 Arsenic, as insecticide, 220 



in sulphate of ammonia, 108 

 Artificial manures, 106 

 Ash in foods, 165 



importance of, to animals, 176 

 Assimilation of carbon dioxide, 80 

 Atomic theory, 2 



weights, 2 

 "Available" plant food in soils, 



60 

 Avenine, 123 

 Azotobacter, 56 



Bacteria, 64, 56, 105, 196 



Bananas, 141 

 Barley, 121 

 Barometer, 26 

 Base, 8 



Basic slag, 112 

 Basicity, 8 

 243 B 



