h, 289;
marsh-gas in, 258;
mineral matter in, 260;
moisture in, 260;
nitric acid in, 259;
nitrogen in, 260;
ratio of, to ash ingredients, 271;
organic matter in, 260;
phosphoretted hydrogen in, 258;
phosphoric acid in, 260;
potash in, 260;
products of decomposition of, 257;
rate of application of, 275;
retrogression of nitrogen in, 142;
rotten, composition of, 287, 288
--value of, 261;
rotting, effects of, on, 262;
solid excreta in, 224;
sulphuretted hydrogen in, 258;
supplemented with nitrogen, 271;
supplemented with phosphoric acid, 272;
temperature, effect of, on soil, 79, 274;
typical compost, 446;
ulmates in, 259;
ulmic acid in, 258;
unfavourable to certain crops, 477;
urine in, 228;
value of, 268;
variation in composition of, 223;
water in, 258.

Fatty acids in guano, 305.

Felspars, 103;
albite, 103;
composition of, 103;
labradorite, 220;
oligoclase, 103, 214, 220;
orthoclase, 103, 214, 220;
phosphoric acid in, 211;
potash manures, 213;
potash in, percentage of, 213, 220.

Ferment, aerobic, 173, 255;
anaerobic, 255.

Fermentation, ammonium carbonate formed during, 245;
in bones, 365;
heat of, 79;
of farmyard manure, 253;
of guano, 299;
temperature of, 256.

Fern, bracken, as litter, 241.

Ferric chloride, test for sulphocyanates, 355.

Fertilisers and Feeding Stuffs Act, 543.

Fertilising ingredients, amount of soluble, in soil, 90;
amounts removed by different crops, 484, 485;
chemical condition of, in soil, 89;
lodge in seed, 491;
in soil, 87.

Fertility, of the soil, 65-97;
potential, of soil, 214, 549;
properties necessary for, 66;
supply of oxygen necessary for, 81.

Field experiments, 545, 548;
educational value of, 547;
on rate of nitrification, 187.

Finger-and-toe prevented by lime, 461.

Fire-fang in farmyard manure, 264.

Fischer on absorption of plant-food, 55.

Fish-guano, 320-323;
application of, 323;
consumption of, 152;
manufacture of, 321;
nitrogen in, 321;
phosphoric acid in, 321;
production of, 322;
source of nitrogen, 152;
value of, 322.

Fixers, 246;
chemical reactions with, 284.

Fleece, potash in, 217.

Fleischer, Professor, on solubility of phosphates, 408.

Flesh-guano, 320.

Flint Island guano, 309.

Flitcham experiments on