By M. Armand Ruffer, M.D., Director of the British Institute of Preventive Medicine.
Charles Darwin and the Origin of Species.
By Edward B. Poulton, M.A., F.R.S., Hope Professor of Zoology in the University of Oxford.
Hermann von Helmholtz.
By A. W. Rücker, F.R.S., Professor of Physics in the Royal College of Science, London.
CASSELL & COMPANY, Limited, London; Paris & Melbourne.
J. Clerk Maxwell
(From a Photograph of the Picture by G. Lowes Dickinson, Esq., in the Hall of Trinity College, Cambridge.)