parts of animals. The cells secreting it are called PIGMENT-CELLS.
PINNATE. — Bearing leaflets on each side of a central stalk.
PISTILS. — The female organs of a flower, which occupy a position in the centre of the other floral organs.
The pistil is generally divisible into the ovary or germen, the style and the stigma.
PLACENTALIA, PLACENTATA. — or PLACENTAL MAMMALS, See MAMMALIA.
PLANTIGRADES. — Quadrupeds which walk upon the whole sole of the foot, like the bears.
PLASTIC. — Readily capable of change.
PLEISTOCENE PERIOD. — The latest portion of the Tertiary epoch.