of, 242;
nitrogen in, 242;
phosphoric acid in, 242;
potash in, 242.

Ducks' dung, analysis of, 331.

Duhamel and Hales, theory of, on plant-growth, 8.

Dundonald, Earl, treatise by, on agricultural chemistry, 13.

Dung and urine, composition of, 234.

Dutrochet on absorption of plant-food, 55.

Dyer, Dr Bernard, analyses of stable manure by, 283;
experiments on peat as litter, 240;
on nitrate of soda as manure for mangolds, 349.

Earth, an adulterant of guano, 319;
composition of solid crust of, 102.

Ecuador, guano deposits at, 327.

Egyptian guano, nitrogen in, 329;
phosphoric acid in, 329.

Elbe, waters of, phosphoric acid in, 206;
potash in, 217.

Elm-tree, water transpired by, 71.

Enderbury Island guano, 309, 328;
phosphoric acid in, 328.

Endosmosis, 55.

English farming, 86.

Equalised guano, 311.

Essex, coprolites from, 374.

Estremadura phosphate, 375.

Ethylamine, nitrification in, 182.

Evaporation from soil, 71, 72, 98.

Excreta, amount of nitrogen in, 149, 292;
composition of, 226, 292;
difference in amount of, for food consumed, 279;
liquid, in farmyard manure, 224;
solid, in farmyard manure, 224;
solid, undigested food in, 224;
solid, voided by cows, 280, 292;
solid, voided by horse, 292;
solid, voided by oxen, 280;
solid, voided by sheep, 280, 292.

Factors for calculating manurial ingredients
into their different compounds, 553.

Falkland guano, 308;
nitrogen in, 330;
phosphoric acid in, 330.

Fallow-fields, nitrates formed in, 188.

Fanning Island guano, 328;
phosphoric acid in, 330.

Farmyard manure, 223-292;
action of, on soils, 273;
ammonia in, 258;
amount produced on farm per year, 252;
analyses of, 259, 286;
application of, 264;
ash of, 287, 288;
carbonic acid gas in, 258;
classes of constituents of, 224;
compared with artificials, 476;
composition of, 259;
denitrification in, 179;
depth to plough to, 267;
effect of, on potatoes, 520;
fertilising matter in, 270;
fire-fang in, 264;
fresh, composition of, 286, 288;
functions of, 268;
heat in fermentation of, 78, 253;
humates in, 259;
humic acid in, 258;
inadequate source of nitrogen to soil, 271;
indirect influence of, 273;
influence of, on soil, 475;
Lawes, Sir John, on composition of, 291;
Lord Kinnaird's experiments wit