fermentation in urine, 255;
on nitrification, 166.

Pastures, accumulation of nitrogen in, 134;
benefited by basic slag, 414;
deficient in lime, 451;
effect of manure on herbage of, 505;
nitrogen in, 158;
permanent, 138, 194
--manuring of, 509;
season influences, 507;
soil influences, 507.

Patagonian guano, 308, 327;
nitrogen in, 330;
phosphoric acid in, 330.

Patent phosphate meal, 405.

Patillos, guano deposits at, 327.

Patos Island, guano deposits at, 328;
phosphoric acid in, 330.

Patterson on superphosphate, 399.

Payen and Boussingault on composition of dried flesh, 425.

Peas, manurial constituents in, 282;
manuring of, 527;
phosphorus in, 205;
source of nitrogen, 153.

Peat, absorbing properties of, 239;
adulterant of guano, 317;
analysis of stable-manure from, 281;
litter, 239;
nitrogen in, 240;
retaining properties of, 240;
soils, 123.

Pelicans, guano from, 297.

Penguin Island guano, 330;
nitrogen in, 330;
phosphoric acid in, 330.

Penguins, guano from, 297.

Percival on carbonic acid in plants, 12.

Peru, guano deposits in, 327;
guano first used in, 297;
nitrate of soda from, 161, 162.

Peruvian guano, 300-306;
appearance of, 303;
composition of, 304-306;
deposits of, 301;
imports of, 151, 297;
source of nitrogen, 151.

Peters and Eichhorn on solvent power of salt, 471.

Petzholdt on sources of plant's nitrogen, 42.

Pfeffer on action of light on plant-growth, 38.

Phoenix Island guano, 309.

Phosphate of iron in Chincha guano, 305.

Phosphate of lime, in Algerian phosphate, 379;
in apatite, 374;
in Belgian phosphate, 377;
in bones, 364;
in Cambridge coprolites, 374;
in Carolina phosphates, 376;
in crust guanos, 379;
in Estremadura phosphate, 375;
in Florida phosphate, 378;
in French phosphates, 379;
in Lahn phosphates, 379;
in Somme phosphate, 378;
reverted in mixing manures, 537.

Phosphates of lime, 385-388, 398;
importance of mechanical condition of, 542.

Phosphates, mineral, 373-381;
imports of, 381;
value as a manure, 380.

Phosphatic guano, 308, 330.

Phosphatic manures, application of, 480.

Phosphoretted hydrogen in farmyard manure, 258.

Phosphoric acid, 199-211;
in ash of plants, 54;
in basic slag, 404;
in bat guano, 325;
in bones, 363;
condition of, i