om soil by, 485;
good effect of gypsum on, 526;
manurial constituents in, 282;
manuring of, 525-527;
phosphorus in, 205;
relative value of manurial ingredients to, 526;
source of nitrogen, 153.

Bean-straw, manurial constituents in, 282.

Beatson, General, experiments of, with Peruvian guano, 301.

Beddington meadows, irrigation at, 432.

Bedfordshire, coprolites from, 374.

Belgian phosphate, 377.

Berthelot on sources of plant-nitrogen, 42.

Biological properties of soil, 92-96.

Blood corpuscles, potash in, 217.

Blood, dried, 424;
composition of, 424;
manure for sugar-cane, 425;
potash in, 217, 219;
rate of nitrification in, 192;
source of nitrogen, 152;
suited for horticulture, 425.

Bohemia, phosphoric acid removed from, 206.

Bolivia, guano deposits at, 327.

Bollaert on nitrate deposits, 333.

Bone-ash, 369;
composition of, 372.

Bone-black, 369;
composition of, 372.

Bone-char, 369;
composition of, 372.

Bone-dust, 360.

Bone-meal, 361, 364;
composition of, 371;
condition of nitrogen in, 540.

Bone-phosphate, 385.

Bones, 359-372;
action of, 365;
boiled, 361;
bruised, 361;
capable of nitrification, 182;
collected in Britain, 353, 362;
composition of, 362, 371;
compound, 372;
crops suited for, 368;
dissolved, 368, 371;
early use of, 359;
fermentation of, 361;
floated, 365;
forms of, 360;
grinding of, 365;
imports of, 151;
inorganic matter in, 363;
nitrogen in, 151;
organic matter in, 363;
putrefaction of, 365, 366;
raw, 361;
source of nitrogen, 151;
treatment of, 364.

Bonnet, Charles, discovery of source of plant's carbon by, 11.

Boracic acid in _salinas_, 335.

Bordeaux phosphate, 379.

Boussingault, on dry matter in horse-manure, 243;
early researches of,
in agricultural chemistry, 21;
experiments by, on nitrification, 185, 198;
on excrements of pig, 250;
on nitrates in guano, 304;
on nitrogen in plants, 41, 42;
on nitrogen in soil, 124;
on nitrogen in excreta, 234;
on nitrogen lost during fermentation, 245.

Bracken-fern, analyses of, 283;
as litter, 241.

Bran, manurial constituents in, 282.

Bretschneider on sources of plant-nitrogen, 42.

Brewers' grain, manurial constituents in, 282.

Bromine in ash of plants, 55.

Browse Island guano, 309, 328;
phosphoric a