Putrefaction, animal, xviii, 397.
— of stagnant water, prevented by animal charcoal, x, 189.
Puvis, essay on lime as a manure, xxx, 138.
Pyrargillite, analysis and description of, Nordenskiöld, xxvi, 387.
Pyrenees, geological notice of, ix, 23.
—, botany of, remarks on, xiv, 377.
Pyrites, arsenical, in New Jersey, v, 244.
—, copper, see under [Copper.]
—, iron, origin of, in fossils, xxviii, 293.
—, —, occurrence of, in fossiliferous rocks, xxxi, 74.