The International Scientifie Series.—(Continued.) 8 
30. 
31. 
32, 
83. 
34, 
35. 
86. 
37. 
45. 
ANIMAL LIFE AS AFFECTED BY THE NATURAL CONDI- 
TIONS OF EXISTENCE. By Kart Semper. With 2 Maps and 
106 Woodeuts. $2.00. 
SIGHT: An Exposition of the Principles of Monocular and Binocular 
Vision. By Joszrpn Lz Conte, LL.D. With 132 Mlustrations. 
$1.50. 
GENERAL PHYSIOLOGY OF MUSCLES AND NERVES. By 
Professor J. Rosentuat. With 75 Illustrations. $1.50. 
ILLUSIONS: A Psychological Study. By James Surny. $1.50. 
THE SUN. By C. A. Youna, Professor of Astronomy in the College 
of New Jersey. With numerous Illustrations. $2.00. 
VOLCANOES : What they Are and what they Teach. By Joan W. 
Jupp, F. RB. 8., Professor of Geology in the Royal School of Mines. 
With 96 Illustrations. $2.00. 
SUICIDE: An Essay in Comparative Moral Statistics. By Henry 
Morsgtut, M. D., Professor of Psychological Medicine, Royal Uni- 
versity, Turin. $1.75. 
THE FORMATION OF VEGETABLE MOULD, THROUGH THE 
ACTION OF WORMS. With Observations on their Habits. By 
Cuares Darwin, LL. D., F.R.§. With Illustrations. $1.50. 
. THE CONCEPTS AND THEORIES OF MODERN PHYSICS. By 
J.B. Statro. $1.75. 
. THE BRAIN AND ITS FUNCTIONS. By J. Luvs. $1.50. 
. MYTH AND SCIENCE. By Tito Vienou. $1.50. 
DISEASES OF MEMORY: An Essay in the Positive Psychology. 
By Tu. Riso, author of “Heredity.” $1.50. 
. ANTS, BEES, AND WASPS. A Record of Observations of the 
Habits of the Social Hymenoptera. By Sir Joun Luszocg, Bart., 
F.R.8., D.C. L., LL. D., ete. $2.00. 
. SCIENCE OF POLITICS. By Suetpon Amos. $1.75. 
. ANIMAL INTELLIGENCE. By Georce J. Romanes. $1.75. 
MAN BEFORE METALS. By N. Jory, Correspondent of the Insti- 
tute. With 148 Ilustrations. $1.75. 
New York: D, APPLETON & CO., 1, 3, & 5 Bond Street. 
