Palæontology. The science which treats of fossil organic remains; it is the zoology and botany of the ancient conditions of the earth.
Palæotherium. A genus of Pachydermata allied to the Tapir.
Pecopteris. A fern of the coal-measures.
Pelagian. Belonging to the sea.
Pentacrinite. A stone lily with five-sided foot-stalk.
Petroleum. Mineral pitch.
Phænogamous, or Phanerogamic plants. Those in which the reproductive organs are apparent.
Phryganea. A family of insects which breed in water.
Phyllolepis. Leaf-scale.
Physical. Literally natural, but used in scientific language in treating of the higher and wider views of various departments with reference to the whole external world, and not to mere human objects.