INDEX 



293 



Cytase, 172 



Dandelion, contracted root of, 



44 

 Decay of organic matter, 129 

 Denitrification, 126 

 Desiccation, 66 

 Dew, 38 

 Diastase, 16, 72 ; function in leaf, 



28 ; in saliva, 172 

 Diet, in digestibility experiment, 



176 ; maintenance, 189 

 Digestibility, of foods, 175 ; experi- 

 ments, 176 

 Digestion, 170; work expended on, 



190 

 Diminishing returns, law of, 263 

 Diphenylamine, test for nitrates, 93 

 Disease, susceptibility of plants to, 



261 

 Dormant plant food, 151 

 Drainage, I15 

 Drift soils, 82 ; glacial, 84 

 Dry farming, 113 

 Dung, short and long, 226 ; London, 



236 

 Dynamic energy, 192, 198 



Early soils, 116 



Earth-nut cake, 180 



Embryo in seed, 7 



Endosperm, 8, 64 



Energy, stored by plants, 33 ; in 

 animal body, r72, 173, 185 ; trans- 

 formed to heat and work, 185 ; 

 available for work, 190, 199 ; 

 dynamic, 190, 192 ; thermal, 188, 

 192 ; total, 187, 192 



Enz)rmes, 16, 72, 76, 171, 203, 272, 

 286 



Equivalents, starch, 184, 215 



Essential oils, 6 



E^ch'ng, action of roots, 4 



Ether, in fat extraction, 169 



Ethers, 75 



Evaporation, cooling efifect of, 109 ; 

 loss of water by, 109, iio ; checked 

 by hoeing, ill ; checked by 

 wind breaks, 1 14 



FiECES, 171, 174, 226 



Fallow on soil moisture, effect of, 

 40, 112 



Farmyard manure, 158, 224; com- 

 position, 234 ; use of, 238, 242 ; 

 duration of, 240 ; physical effects 

 of, 241 ; cost of, 246 



Fats, in plants, 5 ; in foods, 169 ; 

 digestion of, 171 ; heat value of, 

 188 ; in terms of carbohydrates, 

 183 ; fuel value of, 187 ; in milk, 

 270 



Fattening, animals, 195, 207 ; com- 

 position of increase in, 208 



Fehling's solution, 15 



Felspar, 80 



Fermentation, 75 ; aerobic, 128, 129 ; 

 anaerobic, 129, 130; of farmyard 

 manure, 228 



Ferments, 16 



Fern, growing in air-tight bottle, 31 



Fertilisers, 248 ; nitrogenous, 250 ; 

 phosphatic, 254 ; potassic, 257 ; 

 nitrogenous, effect of, 260 ; phos- 

 phatic, effect of, 261 ; potassic, 

 effect of, 257 ; valuation of, 267 ; 

 composition of, 268 



Fertility, maintenance of, 158 



Fibre, in plants, 5, 69 ; in foods, 

 169 ; digestion of, 172, 174 



Film, in soils, the water, lOi 



Fine earth, 86 



Finger-and-toe, 147, 256 



Fish manures, 259 



Fixation of nitrogen, 131 



Flocculation, 92, 108, 115 



Food, used as fuel, 172, 174 ; more 

 digestible than poor, rich, 177 ; 

 valuation of, 183 ; as a source of 

 energy, 185 ; fuel value of, 187 ; 



