i SCIENCE.—ADVERTISEMENTS. 
ANNOUNCEMENT or NEW SCIENTIFIC BOOKS 
TO APPEAR EARLY THIS FALL 
\ 
A System of Medicine by Many Writers 
Edited by THOMAS CLIFFORD ALLBUTT 
M.A., M.D., LL.D., F.R.C.P., F.R.S., F.L.S., F.S.A., 
Regius Professor of Physic in the University of Cambridge, Fellow of Gonville and Caius College, ete. 
Vol. VIII. Completing the Diseases of the Nervous System, etc., including Mental Diseases, etc.. 
Cloth. 8vo. $5.00 net. Half Russia, $6.00 net. 
The British The New York 
Medical Journal says : Medical Journal says : 
“A work which must rank as “‘It is a carefully edited, well 
one of the most important stand- written, progressive, recent book, 
ard books of medical reference and most of its articles bear the 
in English, or indeed in any lan- stamp of authority. . . one of 
guage, that has appeared for many the best systems, if not the best, 
years.”’ in the English language.’’ 
“An elaborate ‘system’ which is destined to become a very important addi- 
tion to our literature.’’—The Journal of the American Medical Association. 
The Liquefaction of Gases A Handbook of Optics 
Its Rise and Development | For Students of Ophthalmology 
By WILLET N. HARDIN, Ph.D., | By WILLIAM N. SUTER, M.D. 
University of Pennsylvania. National University, Washington, D.C. 
Cloth. 12mo. Ready in September. | Cloth. 12mo. Ready in September. 
Our Native Birds The Myxomycetes 
How to Protect Them and Attract Them to | A Handbook of North American Slime Moulds. 
ORE BOnES By THOMAS H. MACBRIDE, 
By D. LANGE, eee Tapeenet 
Divstratcion sieallatinressiady alsenosteto sce venue Moral Professor of Botany, University of Iowa. 
Cloth. 12mo. Ready in September. | Cloth. 12mo. Ready in September. 
By the author of a successful manual of nature study A list of all species described in North America, 
for use in secondary schools. including Central America. 
The Teaching Botanist 
A Manual of Information Upon Botanical Instruction, together with Outlines and Directions for 
a Comprehensive Elementary Course 
By WILLIAM F. GANONG, Ph.D., Smith College. Cloth. 12mo. Ready in September. 
POLITICAL AND SOCIAL SCIENCE AND PHILOSOPHY 
Tropical Colonization | Social Laws 
An Introduction to the Study of the Question | A Translation of Tarde’s ‘‘Zes Lois Sociales’? 
By ALLEYNE IRELAND, | By HOWARD CROSBY WARREN, 
Author of ‘‘Demarariania.’’? With 10 historical charts. | of Princeton University. 
Cloth. 12mo. Ready in September. | With an introduction by J. MARK BALDWIN. 
By an author who has spent ten years in the tropics | Cloth. 12mo. Ready in September.. 
| 
in special study of this subject. Methods of Knowle dge 
Outlines of Civil Government An Essay in Epistemology 
By F. H. CLARK, By WALTER SMITH, 
Lowell High School, San Francisco. of Lake Forest University. 
Cloth. 12mo. Ready in September. Cloth. i2mo. Ready in September. 
A supplement to the students’ edition of Bryce’s A definition of knowledge and study of the methods. 
‘‘American Commonwealth.”’ | by which men have thought it possible to attain it. 
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