By JAMES G. NEEDHAM, Ph.D., Professor of Limnology and General
Biology in Cornell University, and JOHN T. LLOYD, A.B., Assistant in
Limnology in Cornell University.
This book is a broad presentation of the field of freshwater
biology, primarily in its scientific aspects, also in its relation
to commercial, civic, aesthetic and public health interests of man.
There is no book in the English language covering the field. Copiously
illustrated with photographs from Nature. 438 pages; 244 figures. Price
$3.00.