Seward, A.C.—and S.O. Ford.—and J. Gowan.

Sex, recent investigations on.

Sharpe, D.

Sherrington, C.S.

Shirreff, P.

Shrewsbury, Darwin's recollections of.

Sibbern.

Sinapis alba.

Smerinthus ocellata.

Smerinthus populi.