Charles Darwin and the Theory of Natural Selection

by Sir Edward Bagnall Poulton

Michael Faraday: his Life and Work.

By Professor Silvanus P. Thompson, F.R.S.

Pasteur: his Life and Work.

By M. Armand Ruffer, M.D., Director of the British Institute of Preventive Medicine.

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.

Photo by Mr. James C. Christie, F.G.S., Glasgow.

STATUE OF CHARLES DARWIN.