tion, 166, 176.

Chlorophyll, organisms destitute of, 169;
produced by nitrate of soda, 347;
relation of, to fixation of carbon by plants, 37.

Chuca, 341.

Citrate of ammonia, solubility of phosphates in, 408.

Clay, absorptive power of, 68;
analysis of, 107;
grey, evaporation of water from, 99;
loamy, evaporation of water from, 99;
sandy, absorptive power of, 98
--evaporation of water from, 99;
soils, benefited by basic slag, 414
--puddling in, 455;
stiffish, evaporation of water from, 99;
strong absorptive power of, 98.

Clover-hay, fertilising ingredients removed from soil by, 486;
manurial constituents in, 282;
manuring of, 522.

Clover-sickness, 522.

Coal, nitrogen in, 353.

Coke-works, ammonia from, 353, 358.

Colloids, 491.

Colour of soil, 80;
difference in temperature due to, 80.

Columbia, guano deposits at, 327.

Composts, 113, 445-448;
farmyard manure a typical, 446;
manufacture of, 445;
object of, 445;
purposes served by, 445;
substances used for, 447.

Compound bones, 372.

Concretionary nodules, composition of, 328.

Conglomerate, 341.

Connecticut, experimental station at, 33.

Cooke, F. J., on, farmyard manure, 272, 277;
field experiments. 547;
manuring of barley, 497
--of mangels, 514
--of meadow-land, 509
--of swedes, 514
--of wheat, 501.

Copper, oxide of, in plants, 55.

Copperas, as a fixer, 246, 247.

Coprolites, 373;
percentage of phosphates in, 201:
occurrence of, 201, 373.

Corcovado guano, nitrogen in, 329;
phosphoric acid in, 329.

Cordilleras, 340, 341.

Costra, 341.

Cotton-cake, decorticated, manurial constituents in, 282.

Cotton-cake, undecorticated, manurial constituents in, 282.

Cotton-seeds, imports of, 153.

Cova, 341.

Covered manure, potatoes grown with, 289;
wheat grown with, 289.

Cow-dung, alkalies in, 226;
composition of, in dry state, 227;
cool, 225;
nitrogen in, 226;
phosphoric acid in, 226;
water in, 226.

Cow-manure, 247;
amount voided per day, 248;
amount voided per year, 248;
analysis of, 286;
dry matter in, 248;
fermentation in, slow, 248;
mineral matter in, 248;
mucilaginous matter in, 248;
nitrogen in, 248;
resinous matter in, 248.

Cow-urine, alkalies in, 230;
composition of, in dry state, 231;
fertilising ingredients in,