The International Scientific Series — continued. 



XVIII. The NATUEE of LIGHT, with a General Account of 

 PHYSICAL OPTICS. By Dr. Eugene Lommel. With 188 Illua- 

 trations and a Table of Spectra in Chromo-lithography. Fifth Edition. 



XIX. ANIMAL PARASITES and MESSMATES. By Monsieur 



Van Benepen. "With 83 Illustrations. Fourth Edition. 



XX. FERMENTATION. By Professor Schutzenbergeb. With 

 28 Illustrations. Fourth Edition. 



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

 With 91 Illustrations. Sixth Edition. 



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



By Professor Pietro Blaserna. With numerous Illustrations. Fifth 

 Edition. 



XXIII. STUDIES in SPECTRUM ANALYSIS. By J. Norman 



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

 numerous Engravings on Wood. Fifth Edition. 6s. 6d. 



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



By Professor R. H. Thurston. With numerous Illustrations. Fourth 

 Edition. 



XXV. EDUCATION as a SCIENCE. By Alexandre Bain, LL.D. 



Eighth Edition. 



XXVI. The HUMAN SPECIES. By Professor A. de Quatreiages, 

 Membre de l'lnstitut. Fifth Edition. 



XXVII. MODERN CHROMATICS. With Application to Art and 

 Industry. By Ogden N. Rood. Third Edition. With 130 original Illus- 

 trations. 



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

 By T. H. Huxley, F.R.S. Fifth Edition. With 82 Illustrations. 



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



Bastian, M.D. Fourth Edition. With 184 Illustrations. 



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

 lated by E. Clemdjshaw, F.C.S. Sixth Edition. 



XXXI. The NATURAL CONDITIONS of EXISTENCE as 

 they affect Animal Life. By Karl Semper. Fourth Edition 

 With 2 Maps and 106 Woodcuts. 



XXXII. GENERAL PHYSIOLOGYof MUSCLES and NERVES. 



By Prof. J. Rosenthal. Third Edition. With 75 Illustrations. 



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



Binocular Vision. By Joseph Lb Conte, LL.D. Third Edition. With 

 132 Illustrations. 



XXXIV. ILLUSIONS: a Psychological Study. By James Sully. 

 Third Edition. 



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



John W. Judo, F.R.S. Fourth Edition. With 96 Illustrations. 



XXXVI. SUICIDE : an Essay on Comparative Moral Statistics. 



By Professor H. Morselli. Second Edition. 



London : KEG AN PAUL, TRENCH, TRUBNER, & CO., Ltd. 



