Pickering, spectroscopic observations by.

Plants, Darwin's work on the movements of. --geographical distribution of. --Palaeontological record of fossil.

Polymorphic species. --variability in cereals.

POULTON, E.B., on "The Value of Colour in the Struggle for Life". --experiments on Butterflies by. --on J.C. Prichard. --on Mimicry. --various.

Quetelet, statistical investigations by.

Religion, Darwin's attitude towards. --Darwin's influence on the study of. --and Magic.

Religious thought, Darwin's influence on.

Renard, on Darwin's work on volcanic islands.