basic slag, 408;
value of organic nitrogen to plant, 46.

Juergensen on nitrogen in excreta, 234.

Kainit, as a fixer, 247;
potash in, percentage of, 214, 220, 421;
rate of application of, 423.

Kaolin clay, analysis of, 104.

Karmrodt, analysis of Chincha Island guano, 305;
of concretionary nodules, 328.

Karnallite, potash in, 220.

Kellner, experiments on nitrification by, 52.

Kelp, potash in, 420.

Kieserite, 420.

Kinnaird, Lord, experiments by, with farmyard manure, 289.

Kitchen-garden soil, nitrogenous matter in, 122.

Knop on condition of nitrates in soil, 138.

Koosaw River, phosphates from, 376.

Kreatin assimilated by plants, 47.

Kuria Muria guano, 309, 328.

Labrador, guano deposits at, 328.

Labradorite, 214;
potash in, 220.

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

Lahn phosphate, 379.

Lava, phosphoric acid in, 202, 211.

Lawes, Sir J. B., and Gilbert, early researches of, at Rothamsted, 34;
experiments with farmyard manure, 271;
experiments with Peruvian guano, 301;
inauguration of Rothamsted experiments by, 33;
on composition of farmyard manure, 291;
on manuring of wheat, 483;
on motion of plant's sap, 56;
on percentage of food in excreta, 233;
on rate of nitrification, 186;
on sources of plant-nitrogen, 43;
on sulphate of ammonia, 356;
on unexhausted manures, 550, 557-559.

Lawes, Sir J. B., experiments with guano by, 301;
manufacture of superphosphate by, 382;
on application of superphosphate, 395;
on bones, 359;
on composition of farmyard manure, 291;
on farmyard manure, 477;
on loss of nitrates, 142;
on sources of nitrogen, 154.

Leather, as manure, 428;
nitrogen in, 428.

Leaves, dried, as litter, 242;
nitrogen in, 242;
phosphoric acid in, 242;
potash in, 242.

Legrange, Charles, on extent of nitrate-fields, 343.

Leguminous plants, benefited by basic slag, 414
--by potash, 523;
fixation of free nitrogen by, 42;
gain of nitrogen with, 135;
manuring of, 522-527, 530;
nitrogenous manures hurtful to, 523.

Lehmann on ammonia as plant-food, 50, 352.

Leipzig, bones from, 361.

Leones, guano deposits at, 327.

Leucite, potash in, 220.

Lias chalk, phosphoric acid in, 211.

Liebig, criticism of humus theory by, 25;
dissolved bones discovered by, 361;
first report to British Association