ii 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, etc. 
Vol. VIII. Completing the Diseases of the Nervous System, etc., including Mental Diseases, etc. 
Cloth. 8vo. 
The British 
Medical Journal says : 
“A work which must rank as 
one of the most important stand- 
ard books of medical reference 
in English, or indeed in any lan- 
guage, that has appeared for many 
years.’’ 
$5.00 net. 
Half Russia, $6.00 net. 
The New York 
Medical Journal says : 
“‘It is a carefully edited, well 
_ written, progressive, recent book, 
and most of its articles bear the 
stamp of authority. . . one of 
the best systems, if not the best, 
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 
Its Rise and Development 
By WILLET N. HARDIN, Ph.D., 
University of Pennsylvania. 
Cloth. 12mo. Ready in September. 
Our Native Birds 
How to Protect Them and Attract Them to 
5 Our Homes 
By D. LANGE, 
Instructor in Nature Study in Schools of St. Paul, Minn. 
Cloth. 12mo. Ready in ‘September. 
By the author of a successful manual of nature study 
for use in secondary schools. 
A Handbook of Optics 
For Students of Ophthalmology 
By WILLIAM N. SUTER, M.D. 
National University, Washington, D.C. 
Cloth. 12mo. Ready in September. 
The Myxomycetes 
A Handbook of North American Slime Moulds 
By THOMAS H. MACBRIDE, 
Professor of Botany, University of Iowa. 
Cloth. 12mo. Ready in September. 
A list of all species described in North America, 
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 
An Introduction to the Study of the Question 
By ALLEYNE IRELAND, 
Author of ‘‘Demarariania.’? With 10 historical charts. 
Cloth. 12mo. Ready in September. 
By an author who has spent ten years in the tropics 
in special study of this subject. 
Outlines of Civil Government 
By F. H. CLARK, 
Lowell High School, San Francisco. 
Cloth. 12mo. Ready in September. 
A supplement to the students’ edition of Bryce’s 
*¢American Commonwealth.’’ 
Social Laws 
A Translation of Tarde’s ‘‘Les Lois Sociales”? 
By HOWARD CROSBY WARREN, 
of Princeton University. 
With an introduction by J. MARK BALDWIN. 
Cloth. 12mo. Ready in September. 
Methods of Knowledge 
An Essay in Epistemology 
By WALTER SMITH, 
of Lake Forest University. 
Cloth. i2mo. Ready in September. 
A definition of knowledge and study of the methods 
by which men have thought it possible to attain it. 
SEND FOR A FULL LIST OF THE FALL ANNOUNCEMENTS OF 
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