The International Scientific Series—(Continued.) 
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. THE SUN. By C. A. Youne. Professor of Astronomy in the College of New 
MONEY AND THE MECHANISM OF EXCHANGE. BY W. STANLEY 
Jevons, M.A., F.R.S. $1.75. 
THE NATURE OF LIGHT, with a General Account of Physical Optics. By 
Dr. EuGENE LomMeEL. With 183 Illustrations and a Table of Spectra in 
Chromo-lithography. $2.00. 
ANIMAL PARASITES AND MESSMATES. By Monsieur VAN BENEDEN. 
With 838 Illustrations. $1.50. 
. FERMENTATION. By Frofessor ScHUTZENBERGER. With 28 Illustrations. 
$1.50. 
THE FIVE SENSES OF MAN. By Professor BERNSTEIN. With 91 Illus- 
trations. $1.75. 
. THE THEORY OF SOUND IN ITS RELATION TO MUSIC. By Pro- 
fessor PIETRO BLASERNA. With numerous Illustrations. $1.50. 
STUDIES IN SPECTRUM ANALYSIS. By J. Norman Lockyer, F.8.S. 
With 6 Photographic Illustrations of Spectra, and numerous Engrayings 
on Wood. $2.50. 
. A HISTORY OF THE GROWTH OF THE STEAM-ENGINE. By Pro- 
fessor R. H. THurston. With 163 Illustrations. $2.50. 
. EDUCATION AS A SCIENCE. By ALEXANDER Bain, LL.D. $1.7. 
STUDENTS’ TEXT-BOOK OF COLOR; Or, Modern Chromatics. With 
Applications to Art and Industry. By Professor O@DEN N. Roop, Colum- 
bia College. New edition. With 130 Illustrations. $2.00. 
THE HUMAN SPECIES. By Professor A. DE QUATREFAGES, Membre de 
l'Institut. $2.00. 
. THE CRAYFISH: An Introduction to the Study of Zodlogy. By T. H. 
Huxtey, F.R.8. With 82 [lustrations. $1.75. 
. THE ATOMIC THEORY. By Professor A. Wurtz. Translated by E. 
Cleminshaw, F.C.S. $1.50. 
. ANIMAL LIFE AS AFFECTED BY THE NATURAL CONDITIONS OF 
EXISTENCE. By Kart SEMPER. With 2 Maps and 106 Woodcuts. $2.00. 
SIGHT: An Exposition of the Principles of Monocular and Binocular Vision. 
By Joserx Le Conte, LL.D. With 132 Illustrations. $1.50. 
2. GENERAL PHYSIOLOGY OF MUSCLES AND NERVES. By Professor 
J. ROSENTHAL. With 75 llustrations. $1.50. 
ILLUSIONS: A Psychological Study. By JAmMEs Sutiy. $1.50. 
Jersey. With numerous Illustrations. $2.00. 
New York: D. APPLETON & CU.,, 1,3, & 5 Bond Street. 
