The International Scientific Series—(Oontinued). 63 
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Studies in Spectrum Analysis. By J. Norman Lockyer, F.R.S. With six Photographic 
Illustrations of Spectra, and numerous Engravings on Wood. $2.50. 
. 
. A History of the Growth of the Steam-Engine. By Prof. R. H. Tucrston. With 
168 Illustrations. $2.50. 
. Education as a Science. By ALexanper Bary, LL.D. $1.75. 
. Students? Text-Book of Color 3 Or, Modern Chromatics. With Applications to Art and 
Industry. By Prof. Oepen N. Roop, Columbia College. New edition. With 130 Ilustra- 
tions. $2.00. 
. The Human Species. By Prof. A. pz Quatreraces, Membre de l'Institut. $2.00. 
. The Crayfish: An Introduction to the Study of Zoédlogy. By T. H. Huxtey, F.R.S. With 
82 Illustrations. $1.75. 
. The Atomic Theory. By Prof. A. Worrz. Translated by E. Cleminshaw, F.C.&. 
$1.50. : 
Animal Life as affected by the Natural Conditions of Existence. By Karu 
Semper. With two Maps and 106 Woodcuts. $2.00. 
Sight: An Exposition of the Principles of Monocular and Binocular Vision. By Joserx Lz 
Contz, LL.D. With 182 Illustrations. $1.50. 
General Physiology of Muscles and Nerves. By Prof. J. Rosentaan. With 75 Illus- 
trations. $1.50. 
. Illusions: A Psychological Study. By James Sunty. $1.50. 
. The Sun. By C. A. Youna, Professor of Astronomy in the College of New Jersey. With 
numerous Illustrations. $2.00. 
. Voleanoes: What they Are and what they Teach. By Joan W. Jupp, F. R.S., Professor of 
Geology in the Royal School of Mines. With 96 Illustrations, $2.00. 
Suicide: An Essay in Comparative Moral Statistics. By Henry Morsexwt, M.D., Professor 
of Psychological Medicine, Royal University, Turin. $1.75. 
The Formation of Vegetable Mould, through the Action of Worms. With 
Observations on their Habits. By Cartes Darwin, LL.D., F.R.S. With Illustrations. 
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The Concepts and Theories of Modern Physics. By J.B. Sratxo. $1.75. 
The Brain and its Functions. By J. Luys. $1.50. 
Myth and Science. By Tito Vienour. $1.50. : 
Diseases of Memory: An Essay in the Positive Psychology. By Ta. Rigor, author of 
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Ants, Bees, and Wasps. A Record of Observations of the Habits of the Social 
Hymenoptera. By Sir Joan Luszock, Bart., F.R.S., D.C.L., LL.D., ete. $2.00. 
Science of Politics. By Saexpon Amos. $1.75. 
Animal Intelligence. By Gzorce J. Romanes. $1.5. 
Man before Metals. By N. Jouy, Correspondent of the Institute. With 148 Illustrations. 
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The Organs of Speech and their Application in the Formation of Articu- 
late Sounds. By G. H. von Meyer, Professor in Ordinary of Anatomy at the University 
of Ziirich. With 47 Woodcuts. $1.75. 
Fallacies: A View of Logic from the Practical Side. By Atrrep Swewics, B. A., Oxon 
$1.75. 
