, 24;
manufacture of superphosphate from bones by, 359;
mineral theory of, 26-29;
on ammonia as a manure, 352;
on importation of bones by Britain, 360;
researches of, in agricultural chemistry, 23-32;
services of, to agricultural chemistry, 31;
theory of manures by, 29;
theory of, on rotation of crops, 29.

Light, action of, on plant-growth, 38.

Lime, 449-461;
abundant occurrence of, 452;
action of, 461
--contradictory, 450
--not thoroughly understood, 449
--on nitrogenous organic matter, 460
--on soil's texture, 455;
antiquity of, as a manure, 449;
binding effect of, 457;
biological action of, 459;
caustic, 453;
chemical action of, 457;
decomposes minerals, 458;
different forms of, 453;
effect of, on soils, 112;
fixed by soils, 58;
in ash of plants, 54;
mechanical functions of, 455;
mild, 453;
necessary for nitrification, 171, 459
--for plant-growth, 55, 450;
neutralises acidity in soils, 458;
phosphates of, 385-388;
pig excrements contain, 281;
prevents clay puddling, 456;
returned to soil, 452;
soils contain, 450-452.

Limestone, analyses of, 106;
evaporation of water from, 99;
occurrence of, 452.

Linseed, imports of, 153;
manurial constituents of, 282.

Linseed-cake, manurial constituents of, 282.

Liquid manure, 442-444.

Lithia in ash of plants, 55.

Litter, loam as, 239;
peat as, 240;
straw as, 236;
uses of, 236.

Lloyd on fattening animals, 253.

Loam, as litter, 239;
evaporation of water from, 99;
poor in fertilising matter, 239.

Lobos, guano deposits at, 327.

Lobos de Afuera guano, 302, 327.

Macabi Island guano, 302, 327;
nitrogen in, 329;
phosphoric acid in, 329.

Maercker, Professor, on destruction of nitrifying organisms, 177.

Magnesia, fixed by soils, 58;
in ash of plants, 54;
in pig excrements, 281;
necessary for nitrification, 171;
necessary for plant-growth, 55;
sulphate of, as a fixer, 246, 285.

Maize, absorbs ammonia, 352;
fertilising ingredients removed from soil by, 485;
manurial constituents in, 282;
source of nitrogen, 153.

Malden Island guano, 309, 328;
phosphoric acid in, 330.

Malpighi on importance of atmospheric air for germination, 39.

Malt-dust, manurial constituents in, 282.

Manganese, oxide of, in ash of plants, 54.

Mangels, fertili