cid in, 330.

Bruestlein and Peters on fixation of bases and acids by soil, 59.

Buckland, Dr, discovery of coprolites by, 373.

Buckwheat absorbs ammonia, 352.

Bull River, phosphates from, 376.

Cabbages, benefited by saline manures, 529;
manuring of, 528-529;
soils suited for, 529.

Caird, Sir James, experiments by, with Peruvian guano, 301.

Calcareous earth, absorptive power of, 98;
stones, phosphoric acid in, 211.

Calcium phosphate in Chincha guano, 305.

Calcium sulphate in concretionary nodules, 328.

_Caliche_, composition of, 342;
occurrence of, 341.

California, guano deposits at, 328.

Cambridgeshire, coprolites from, 373.

Cameron, Sir Charles, on assimilation of urea by plants, 46.

Canadian apatite, 201, 374.

Cape Vert guano, phosphoric acid in, 330.

Carbolic acid, action of, on nitrifying organisms, 177.

Carbon, fixation of, by plants, 37;
in plants, discovery of source of, 11.

Carbon bisulphide, effect of, on nitrification, 166, 176.

Carbonate of ammonia formed in fermentation of dung, 247, 258.

Carbonic acid, absorbed by plants, 12
--by soil, 81;
in ash of plants, 55;
oxidation of, by bacteria, 95;
produced in decomposition of farmyard manure, 258.

Carbonising-works, ammonia from, 353, 358.

Carburetted hydrogen, produced in decomposition of farmyard manure, 258.

Caribbean phosphates, 379.

Carnallite, 420.

Carolina phosphate, 376.

Carrots, manurial constituents in, 282.

Catacombs, bones from, 360.

Catch-cropping, 138, 489.

Cattle foods, average composition of, 557.

Caustic lime, 453.

Cereals, manuring of, 493-504;
nitrogenous manures benefit, 494;
potash in, 217;
silicates absorbed by, 494;
value of nitrate of soda as manure for, 346.

Chalk, an adulterant of guano, 319;
lias, phosphoric acid in, 211.

Charcoal, a filter for sewage, 437.

Charleston phosphate, 376.

Chemical analysis of manures, interpretation of, 539;
value of, 539.

Chemical composition of soil, 87-92.

Cheshire, bones used in, 360.

Chesterfield Island guano, 309.

Chili and Peru, chief source of nitrate of soda, 162.

Chincha Island guano, 302, 303, 327;
composition of, 305;
nitrogen in, 329;
phosphoric acid in, 329.

Chipana, guano deposits at, 327.

Chlorapatite, composition of, 210.

Chlorine in ash of plants, 55.

Chloroform prevents nitrifica