The subject is presented in untechnical language and without the use of mathematics. Professor Poor shows by what steps the precise knowledge of to-day has been reached and explains the marvellous results of modern observations.
19.--+Climate--Considered Especially in Relation to Man.+ By ROBERT DECOURCY WARD, Assistant Professor of Climatology in Harvard University. 8º. Illustrated. Net, $2.00.
This volume is intended for persons who have not had special training in the technicalities of climatology. Climate covers a wholly different field from that included in the meteorological text-books. It handles broad questions of climate in a way which has not been attempted in a single volume. The needs of the teacher and student have been kept constantly in mind.
20.--+Heredity.+ By J. ARTHUR THOMSON, M.A., Professor of Natural History in the University of Aberdeen; Author of "The Science of Life," etc. 8º. Illustrated. Net, $3.50.
The aim of this work is to expound, in a simple manner, the facts of heredity and inheritance as at present known, the general conclusions which have been securely established, and the more important theories which have been formulated.
21.--+Age, Growth, and Death.+ By CHARLES S. MINOT, James Stillman Professor of Comparative Anatomy in Harvard University, President of the Boston Society of Natural History, and Author of "Human Embryology," "A Laboratory Text-book of Embryology," etc. 8º. Illustrated.
This volume deals with some of the fundamental problems of biology, and presents a series of views (the results of nearly thirty years of study), which the author has correlated for the first time in systematic form.
22.--+The Interpretation of Nature.+ By C. LLOYD MORGAN, LL. D., F. R. S. Crown 8vo. Net, $1.25.
Dr. Morgan seeks to prove that a belief in purpose as the causal reality of which Nature is an expression is not inconsistent with a full and whole-hearted acceptance of the explanations of naturalism.
23.--+Mosquito Life.+ The Habits and Life Cycles of the Known Mosquitoes of the United States; Methods for their Control; and Keys for Easy Identification of the Species in their Various Stages. An account based on the investigation of the late James William Dupree, Surgeon-General of Louisiana, and upon the original observations by the Writer. By EVELYN GROESBEECK MITCHELL, A.B., M.S. With 64 Illustrations. Crown 8vo. Net, $2.00.