The International Scientific Series continued, 



XXII. The THEOBYof SOUND in its BELATIONto MUSIC. 



By Professor PEETRO BLASERNA. With numerous Illustrations. Third 

 Edition. 5s. 



XXIII. STUDIES in SPECTKUM ANALYSIS. By J. NOBMAK 



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

 numerous Engravings on Wood. Third Edition. 6*. 6d. 



XXIV. A HISTOBY of the GBOWTH of the STEAM ENGINE. 



By Professor R. H. THUBSTON. With numerous Illustrations. Third 

 Edition. 6s. 6d. 



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



Fourth Edition. 5s. 



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

 Membre de I'Institut. Third Edition. 5s. 



XXVII. MODEBN CHBOMATICS. With Application to Art and 

 Industry. By OGDEN N. ROOD. Second Edition. With 130 original Illus- 

 trations. 55. 



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

 By T. H. HUXLEY, F.R.S. Fourth Edition. With 82 Illustrations. 5s. 



XXIX. The BBAIN as an OBGAN of MIND. By H. CHABLTON 

 BASTIAN, M.D. Third Edition. With 184 Illustrations. 5*. 



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

 lated by E. CLEMINSHAW, F.C.S. Third Edition. 5*. 



XXXI. The NATURAL CONDITIONS of EXISTENCE as 

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

 With 2 Maps and 106 Woodcuts. 6s. 



XXXII. GENEBAL PHYSIOLOGY of MUSCLES and NEBVES 



By Prof. J. ROSENTHAL. Third Edition. With Illustrations. 5s. 



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



Binocular Vision. By JOSEPH LB.CONTE, LL.D. Second Edition. With 

 132 Illustrations. 5*. 



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



Second Edition. 5s. 



London: KEG AN PAUL TRENCH, & CO. , 1 Paternoster Square. 



