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ZOOLOGY 
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The Collected Essays of ALFRED RUSSEL WALLACE, LL.D:, D.C.L., F.R.S., Etc. 
Author of ‘‘'The Malay Archipelago,’ ‘‘ Natural Selection and Tropical Nature,’’ ‘‘ Darwinism,’ etc. 
Brief statements in untechnical form of the positions reached during recent years by the foremost exponent 
of what is known as the Darwinian theory. The papers in the first volume are grouped by their subjects as 
on Barth Studies, Plant and Animal Distribution, Anthropology, etc. The second contains Educational, Political, 
Ethical and Sociological Papers. Illustrated. 2 volumes, cr. 8vo, $5.00. 
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Just Ready. A TEXT=-BOOK OF THE EMBRYOLOGY Part IV. 
Of Invertebrates. By Dr. EH. Korscuerr, in the University of Marburg, and Dr. K. Hurper, in the Univyer- 
Part I., $4.00 net. sity of Berlin. Part I. translated by Epwarp L. Marx, Ph.D., and W. M. M. 
Part II., $3.00 net. Woopworrnu, Ph,D., Harvard University. Parts II. to IV. translated by Mararmpa 
Part IIl., $3.25 net. BERNARD. Revised and edited by Martin F. Woopwarp, London. Fully illus- 
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Of Man and Mammals. By Dr. Oscar Herrwia, of the University of Berlin. Translated from the Third 
German Edition by Epwarp L. Marx, Ph.D., Harvard University. Second Edition, $5.25 net. 
“A general text-book of vertebrate embryology. As such a text-book it is of the greatest value to a student.’’—SCIENCE. 
A TREATISE ON ZOOLOGY 
Edited with an Introduction by 
E. Ray Lanxester, LL.D., F.R.S., Director of the Natural History Departments of the British Museum. 
Part 11. The Porifera and Ceelentera. By E. A. Mrncury, G. Herserr Fowisr, 
Ph.D., and Gitpertr C. Bourne. 8vo. Cloth. $5.50 net. 
Previously issued: Vol. 111. Echinoderma. Cloth. 8vo. $5.25 net. 
ASTRONOMY THE ELEMENTS OF ASTRONOMY 
By the author of ‘‘Star- 
land,’’ ‘‘Atlas of Astron- : j ; 
omy,” ‘The Story of the sity of Cambridge. 
Sun,’’ etc., ete. 
ANTHROPOLOGY 
THE HUMAN EAR: ITS IDENTIFICATION AND PHYSIOGNOMY 
BONE 4 192 USERS By Mrrian Anne Evris. With Illustrations from Photographs chiefly from Nature- 
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BOTANY HANDBOOK OF PRACTICAL BOTANY 
For rae Boranican By D. E. Srraspuraer, University of Bonn. ‘Translated and edited by W. Wrt1- 
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159 original and a few additional illustrations. Cloth. 8vo. $2.60 net 
BOTANY. AN ELEMENTARY TEXT FOR SCHOOLS 
By Prof. L., H. Baruny, Cornell University, Author of ‘‘ Lessons, with Plants, etc.’’ Illustrated. 
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By Sir Roperr Bax, LL.D., Professor of Astronomy and Geometry in the Univer- 
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