3O A List of 



XVII. Money and the Mechanism of Exchange. By W. 



Stanley Jevons, M.A., F.R.S. Fifth Edition. Crown 8vo, $s. 



XVIII. The Nature of Light. With a General Account of Physical 

 Optics. By Dr. Eugene Lommel. With 188 Illustrations and a 

 Table of Spectra in Chromo-lithography. Third Edition. Crown 

 8vo, 5*. 



XIX. Animal Parasites and Messmates. By Monsieur Var. 



Beneden. With 83 Illustrations. Second Edition. Crown 8vo, 5.5-. 



XX. Fermentation. By Professor Schutzenberger. With 28 Illus- 



trations. Third Edition. Crown 8vo, $s. 



XXI. The Five Senses of Man. By Professor Bernstein. With 



91 Illustrations. Third Edition. Crown 8vo, $s. 



XXII. The Theory of Sound in its Relation to Music. By Pro- 



fessor Pietro Blaserna. With numerous Illustrations. Second 

 Edition. Crown 8vo, 5J. 



XXIII. Studies in Spectrum Analysis. By J. Norman Lockyer, 

 F.R.S. With six photographic Illustrations of Spectra, and 

 numerous engravings on Wood. Crown 8vo. Second Edition. 

 dr. (xt. 



XXIV. A History of the Growth of the Steam Engine. By 



Professor R. H. Thurston. With numerous Illustrations. Second 

 Edition. Crown 8vo, 6s. 6d. 



XXV. Education as a Science. By Alexander Bain, LL.D. Fourth 



Edition. Crown 8vo, 51. 



XXVI. The Human Species. By Professor A. de Quatrefages. Third 



Edition. Crown 8vo, 5J. 



XXVII. Modern Chromatics. With Applications to Art and In- 

 dustry. By Ogden N. Rood. With 130 original Illustrations. 

 Second Edition. Crown 8vo, $j. 



XXVIII. The Crayfish : an Introduction to the Study of Zoology. By 

 Professor T. H. Huxley. With 82 Illustrations. Third Edition. 

 Crown 8vo, $s. 



XXIX. The Brain as an Organ of Mind. By H. Charlton Bastian, 

 M.D. With numerous Illustrations. Third Edition. Crown 

 8vo, 5*. 



XXX. The Atomic Theory. By Prof. Wurtz. Translated by G. 



Cleminshaw, F.C.S. Third Edition. Crown 8 vo, 5.?. 



XXXI. The Natural Conditions of Existence as they affect 

 Animal Life. By Karl Semper. With 2 Maps and 106 

 Woodcuts. Second Edition. Crown 8vo, $s. 



XXXII. General Physiology of Muscles and Nerves. By Prof. 

 J. Rosenthal. Second Edition. With Illustrations. Crown 8vo, 



