Bacon, on mutability of species.

Barber, Mrs M.E., on Papilio nireus.

Bates, H.W., on Mimicry. --Letters from Darwin to. --elsewhere.

BATESON, W., on "Heredity and Variation in Modern lights". --on discontinuous evolution. --on hybridisation.

Beebe, C.W., on the plumage of birds. --on sexual selection.

Bell's (Sir Charles) "Anatomy of Expression".

Bentham, G., on Darwin's species-theory. --on geographical distribution.

Bickford, E., experiments on degeneration by.