The International Scientific Series continued. 



XX. FERMENTATION. By Professor SCHUTZENBEBGEB. With 

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XXI. The FIVE SENSES of MAN. By Professor BEBNSTEIN. 

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XXII. The THEORY of SOUND in its RELATION to MUSIC. 



By Professor PIETRO BLASERNA. With numerous Illustrations. Sixth 

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XXIII. STUDIES in SPECTRUM ANALYSIS. By J. NOBMAN 



LOCKTER, F.R.S. With Six Photographic Illustrations of Spectra, and 

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XXIV. A HISTORY of the GROWTH of the STEAM ENGINE. 



By Professor R. H. THURSTON. With numerous Illustrations. Fifth 

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XXV. EDUCATION as a SCIENCE. By ALEXANDEB BAIN, LL.D. 



Ninth Edition. 



XXVI. The HUMAN SPECIES. By Professor A. DE QTJATBEFAGES, 



Membre de 1'Institut. Fifth Edition. 



XXVII. MODERN CHROMATICS. With Application to Art and 

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XXVIII. The CRAYFISH : an Introduction to the Study of Zoology. 

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XXIX. The BRAIN as an ORGAN of MIND. By H. CHARLTON 

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XXX. The ATOMIC THEORY. By Professor A. WUBTZ. Trans- 

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XXXI. The NATURAL CONDITIONS of EXISTENCE as 

 they affect Animal Life. By KARL SEMPER. Fifth Edition. 

 With 2 Maps and 106 Woodcuts. 



XXXII. GENERAL PHYSIOLOGYof MUSCLES and NERVES. 



By Prof. J. ROSENTHAL. Fourth Edition. With 75 Illustrations. 



XXXIII. SIGHT : an Exposition of the Principles of Monocular and 



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XXXIV. ILLUSIONS: a Psychological Study. By JAMES SULLY. 



Fourth Edition. 



XXXV. VOLCANOES : what they are and what they teach. By 



JOHN W. J0DD, F.R.S. Fifth Edition. With 96 Illustrations. 



XXXVI. SUICIDE : an Essay on Comparative Moral Statistics. 



By Professor H. MORSELLI. Third Edition. 



XXXVII. The BRAIN and its FUNCTIONS. By J. LTJYS, 



Physician to the Hospice de la Salpetriere. With numerous Illus- 

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XXXVIII. MYTH and SCIENCE: an Essay. By TITO VIGNOLI. 



Fourth Edition. 



XXXIX. The SUN. By C. A. YOUNG, Ph.D., LL.D. Fifth Edition. 

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XL. ANTS, BEES, and "WASPS. A Eecord of Observations 

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XLI. ANIMAL INTELLIGENCE. By GEORGE J. EOMANES, 

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XLII. The CONCEPTS and THEORIES of MODERN 

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