Poincare.
Polarity, Vochting on.
Polymorphic species.—variability in cereals.
Polypodium incanum.
Porthesia chrysorrhoea.
Potonie, R.
Pouchet, G.
POULTON, E.B., on "The Value of Colour in the Struggle for Life".—experiments on Butterflies by.—on J.C. Prichard.—on Mimicry.—various.
Pratt.
Pratz, du.