XX. Fermentation. By Professor Schützenberger, Director of the Chemical Laboratory at the Sorbonne. With 28 Illustrations. Third Edition. Crown 8vo. price 5s.
XXI. The Five Senses of Man. By Professor Bernstein, of the University of Halle. With 91 Illustrations. Second Edition. Crown 8vo. price 5s.
XXII. The Theory of Sound in its Relation to Music. By Professor Pietro Blaserna, of the Royal University of Rome. With numerous Illustrations. Second Edition. Crown 8vo. price 5s.
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. Price 6s. 6d.
XXIV. A History of the Growth of the Steam Engine. By Professor R. H. Thurston. With numerous Illustrations. Second Edition. Crown 8vo. cloth, price 6s. 6d.
XXV. Education as a Science. By Alexander Bain, LL.D. Third Edition. Crown 8vo. cloth, price 5s.
XXVI. The Human Species. By Prof. A. de Quatrefages. Third Edition. Crown 8vo. cloth, price 5s.
XXVII. Modern Chromatics. With Applications to Art and Industry. By Ogden N. Rood. With 130 original Illustrations. Second Edition. Crown 8vo. cloth, price 5s.
XXVIII. The Crayfish: an Introduction to the Study of Zoology, By Professor T. H. Huxley. With 82 Illustrations. Third Edition. Crown 8vo. cloth, price 5s.
XXIX. The Brain as an Organ of Mind. By H. Charlton Bastian, M.D. With numerous Illustrations. Second Edition. Crown 8vo. cloth, price 5s.