2 The International Sctentifie Series—(Continued.) 
——— 
17. MONEY AND THE MECHANISM OF EXCHANGE. By W. STANLEY 
Jevons, M.A, F.R.S. $1.75. 
18, THE NATURE OF LIGHT, with a General Account of Physical Optics. By 
Dr. Evcens Lommen. With 188 Illustrations and a Table of Spectra in 
Chromo-lithography. $2.00. 
19. ANIMAL PARASITES AND MESSMATES. By Monsieur Van BENEDEN. 
With 83 Llustrations. $1.50. 
20. FERMENTATION. By Professor ScHUTZENBERGER. With 28 Hlustrations. 
$1.50. 
21. THE FIVE SENSES OF MAN. By Professor BernsTErn. With 91 Illus- 
trations, $1.75. 
22, THE THEORY OF SOUND IN ITS RELATION TO MUSIC. By Pro- 
fessor Pistro BLAsERNA. With numerous Illustrations. $1.50. 
23. STUDIES IN SPECTRUM ANALYSIS. By J. Norman Lockyer, F.R.8. 
With 6 Photographic Illustrations of Spectra, and numerous Engravings 
on Wood. $2.50. 
24. A HISTORY OF THE GROWTH OF THE STEAM-ENGINE. By Pro- 
fessor R, H. Taursron. With 163 Illustrations. $2.50. 
25. EDUCATION AS A SCIENCE. By ALexanpzR Barn, LL.D. $1.75. 
26. STUDENTS’ TEXT-BOOK OF COLOR; Or, Modern Chromatics. With 
Applications to Art and Industry. By Professor OepEN N. Roop, Colum- 
bia College. New edition. With 120 Illustrations. $2.00. 
27, THE HUMAN SPECIES. By Professor A. DE QuatREFAGES, Membre de 
l'Institut. $2.00. 
28. THE CRAYFISH: An Introduction to the Study of Zodlogy. By T. H. 
Huxiey, F.R.8. With 82 Mlustrations. $1.75. 
29. THE ATOMIC THEORY. By Professor A. Wurrz. Translated by E. 
Cleminshaw, F.C.S. $1.50. 
30. ANIMAL LIFE AS AFFECTED BY THE NATURAL CONDITIONS OF 
EXISTENCE. By Karz SEMPER. With 2 Maps and 106 Woodcuts. $2.00. 
31. SIGHT: An Exposition of the Principles of Monocular and Binocular Vision. 
By Joszpu Lz Contre, LL.D. With 132 Illustrations. $1.50. 
32. GENERAL PHYSIOLOGY OF MUSCLES AND NERVES. By Professor 
J Rosentaar. With 75 Illustrations. $1.50. 
83. ILLUSIONS : A Psychological Study. By James Sutiy. $1.50. 
84. THE SUN. By C. A. Youne, Professor of Astronomy in the College of New 
Jersey, With numerous Illustrations. $2.00. 
New York: D. APPLETON & CO., 1, 3, & 5 Bond Street. 
