ments on rate of nitrification, 186;
on composition of farmyard manure, 260;
on manufacture of superphosphate, 383;
on manurial constituents of foods, 282;
on nitrification in alkaline solutions, 197;
on nitrogen in excrements, 233;
on nitrogen in soil, 122;
on potash in wool, 227;
researches of, on nitrification, 35, 52, 166-168, 180, 186.

Water, absorbed by plants, 73;
amount of, transpired by plant-leaves, 56;
an adulterant of guano, 319;
a carrier of plant-food, 55;
in cow-dung, 226
--cow-urine, 230;
from decomposition of farmyard manure, 257;
in horse-dung, 226
--horse-urine, 230;
necessary for plant, 67;
in pig-dung, 226
--pig-urine, 230
--sheep-dung, 226
--sheep-urine, 230;
transpired by elm-tree, 71
--oak-tree, 71.

Water-culture, 54.

Water-logged soils, 179.

Waterloo, bones from, 360.

Way, Thomas, on retention of plant-food by soil, 57, 59;
on sewage, 437.

West Indies, guano from, 298.

Whales, guano from, 322.

Wheat, fertilising ingredients removed from soil by, 485;
Flitcham experiments on, 500;
manurial constituents in, 282;
manuring of, 499-501
nitrogen removed in crop of, 145;
requires nitrogenous manures, 499;
Rothamsted experiments on, 500, 562-565;
a source of nitrogen, 153.

Wheat soils, nitrates in, 157.

Wheat-straw, analysis of stable manure made from, 283;
composition of, 238;
manurial constituents in, 282.

White clover, growth of, promoted by lime, 451.

Wiegmann on ash constituents of plants, 53.

Wilfarth on nitrogen in plants, 44.

Wilting, 73.

Winogradsky, on nitrification, 52, 167, 169, 197;
on organisms in soil, 94.

Wolff on, analysis of manure-heap drainings, 290;
composition of fresh and rotten dung, 288;
assimilation of organic nitrogen by plants, 47;
relative manurial value of manurial compounds, 556;
urine, 232.

Wood-ashes as potash manure, 218, 419.

Woodhouse, researches of, on nitrogen in plants, 41.

Wool, capable of nitrification, 182;
potash in, 217.

Wool-waste, 427;
nitrogen in, 427.

Woolney, on organisms in soils, 93, 95;
on water in soils, 75.

Wrightson, Professor, on application of basic slag, 414.

Yeast, 94.

Yorkshire, bones first used in, 359.

Zeolites, potash in, 220

PRINTED BY WILLIAM BLACKWOOD AND SONS.

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