The International Scientific Series—continued. 
XXI. The FIVE SENSES of MAN. By Professor Bernstein. 
With 91 Illustrations, Seventh Edition. 
XXIL The THEORY of SOUND in its RELATION to MUSIC. 
By Professor Prrrro BLAsSERNA. With numerous Illustrations. Sixth 
Edition. 
XXIII. STUDIES in SPECTRUM ANALYSIS. By J. Norman 
LocKYER, F.R.S. With Six Photographic lustrations 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. Fifth 
Edition. 
XXV. EDUCATION as a SCIENCE. By Arexanper Barn, LL.D. 
Ninth Edition. 
XXVI. The HUMAN SPECIES. By Professor A. pz QUATREFAGES, 
Membre de l’Institut. Fifth Edition. 
XXVII. MODERN CHROMATICS. With Application to Art and 
Industry. By Oapzn N. Roop. Third Edition, With 130 original 
Tllustrations. 
XXVIII. The CRAYFISH: an Introduction to the Study of Zoology. 
By T. H. Huxtey, F.R.8, Sixth Edition. With 82 Illustrations. 
XXIX. The BRAIN as an ORGAN of MIND. By H. Cuariton 
Bastian, M.D. Fourth Edition. With 184 Mlustrations. 
XXX, The ATOMIC THEORY. By Professor A, Wurtz. Trans- 
lated by E. CLEMINeHAW, F.C.S. Seventh Edition. 
XXXI. The NATURAL CONDITIONS of EXISTENCE as 
they affect Animal Life. By Kart Sempsr. Fifth Edition. 
With 2 Maps and 106 Woodcuts, 
XXXII. GENERAL PHYSIOLOGYof MUSCLES and NERVES. 
By Prof. J. RosENTHAL. Fourth Edition. With 75 Illustrations. 
XXXII. SIGHT: an Exposition of the Principles of Monocular and 
Binocular Vision. By JoszrH Lz Contr, LL.D. Third Edition. With 
132 Mlustrations. 2 
XXXIV. ILLUSIONS: a Psychological Study. By Jamus Suny. 
Fourth Edition. 
XXXV. VOLCANOES: what they are and what they teach. By 
JouNn W. Jupp, F.R.S. Fifth Edition. With 96 Illustrations. 
XXXVI. SUICIDE: an Essay on Comparative Moral Statistics. 
By Professor H. Morseiui. Third Edition. 
XXXVII. The BRAIN and its FUNCTIONS. By J. Lvys, 
Physician to the Hospice de la Salpétriére. With 
trations. Third Edition. © - notaesena Tine 
XXXVIII. MYTH and SCIENCE: an Essay. By Trro Viewou, 
Fourth Edition, 
XXXIX. The SUN. By C. A. Youne, Ph.D., LL.D. Fifth Edition 
With numerous Illustrations. ‘ 
XL. ANTS, BEES, and WASPS. A Record of Observations 
on the Habits of the Social Hymenoptera. By Lord 
Fourteenth Edition. With 5 Chromo-lithographic Plates, oe nes 
XLI. ANIMAL INTELLIGENCE. By Gro. 
LL.D., F.R.S. Sixth Edition. f nou J. Rowanzs, 
XLIT. The CONCEPTS and THEORIES of 
PHYSICS, ByJ.B.8ratio, Third Edition MODERN 
XLITI. DISEASES of MEMORY. An Ess: i iti 
Psychology. By TH. Risor. * Fourth Rdition, Bp ae Ane: cPoaiere 
London: KEGAN PAUL, TRENCH, TRUBNER, & CO., Lrp. 
