"It has the remarkable feature of combining extraordinary profusion of precise information with an elegance of literary style quite unusual in scientific authors."—The Academy.
PUBLISHED BY
ADAM & CHARLES BLACK . SOHO SQUARE . LONDON
BY THE SAME AUTHOR
PROBLEMS IN ASTROPHYSICS
Demy 8vo. 560 pages. Cloth.
Containing 50 Illustrations in the Text and 31 Plates
Price 20s. net