ica, analysis of, 105;
potash in, 214, 220.

Micro-organisms, convert ammonia into nitrous acid, 167;
convert nitrous acid into nitric acid, 168;
effect fermentation, 80;
effect fixation of free nitrogen, 44;
effect nitrification, 161;
oxidising power of, 197.

Mild lime, 453.

Milk, nitrification in albuminoids of, 182;
nitrogen removed in, 147;
phosphoric acid removed in, 207;
potash removed in, 218.

Mineral phosphates, 373-381;
value of, as a manure, 380.

Mineral salts necessary for nitrification, 52.

Minor artificial manures, 424-429.

Mixing manures, 532-538;
ammonia lost in, 533;
nitric acid lost in, 536;
phosphates reverted in, 536.

Moisture, atmospheric, action on guano, 300;
in farmyard manure, 260;
in manures, 543;
necessary for nitrification, 52, 176.

Molds, 94.

Mona guano, 309.

Mond, Ludwig, on nitrogen in coal, 354.

Monks guano, 327;
phosphoric acid in, 330.

Monocalcic phosphate, 386;
formula of, 398;
molecular composition of, 398;
percentage composition of, 398;
reversion of, with iron and alumina compounds, 399
--with tricalcic phosphate, 399.

Mulder on humus in soil, 47, 126.

Mueller, A., on nitrogen in soil, 121, 124.

Munro, Dr J. M. H., on nitrification, 52;
on sewage-sludge as manure, 439;
on urine voided, 292.

Muentz, on ammonia in air, 118;
on nitrifying organisms in soil, 180;
on oxidising power of micro-organisms, 197.

Muriate of potash, application of, 423;
forms calcium chloride, 422;
harmful effects of, 421;
more concentrated than sulphate, 422.

Mustard, 139.

Navassa phosphate, 308, 328, 379.

Nesbit on composition of guano, 301.

New Granada, guano deposits at, 327.

New Zealand, meat-meal guano from, 324.

Nile, nitrates in waters of, 159.

"Nitraries," 163.

Nitrate-fields, appearance of, 340;
origin of, 334.

Nitrate of soda, 332-351;
amount exported from Chili, 151, 332, 351;
amount imported into Britain, 151, 351;
appearance of fields of, 340;
application of, 347;
Chili and Peru chief source of, 161;
composition of, 343;
crops suited by, 346;
discovery of deposits of, 333;
extent of deposits of, 342;
encourages deep roots, 344;
formation of fields of, 334-340;
method of applying, 347;
method of mining, 341;
nitric acid in, source of, 337;
nitrogen i