XV. The Chemical Effects of Light and Photography. By Dr. Hermann Vogel (Polytechnic Academy of Berlin). With 100 Illustrations. Third and Revised Edition. Crown 8vo. Cloth, price 5s.
XVI. The Life and Growth of Language. By William Dwight Whitney, Professor of Sanskrit and Comparative Philology in Yale College, New Haven. Second Edition. Crown 8vo. Cloth, price 5s.
XVII. Money and the Mechanism of Exchange. By W. Stanley Jevons, M.A., F.R.S. Fourth Edition. Crown 8vo. Cloth, price 5s.
XVIII. The Nature of Light: With a General Account of Physical Optics. By Dr. Eugene Lommel, Professor of Physics in the University of Erlangen. With 188 Illustrations and a table of Spectra in Chromo-lithography. Second Edition. Crown 8vo. Cloth, price 5s.
XIX. Animal Parasites and Messmates. By Monsieur Van Beneden, Professor of the University of Louvain, Correspondent of the Institute of France. With 83 Illustrations. Second Edition. Crown 8vo. Cloth, price 5s.
XX. Fermentation. By Professor Schützenberger, Director of the Chemical Laboratory at the Sorbonne. With 28 Illustrations. Second Edition. Crown 8vo. Cloth, price 5s.
XXI. The Five Senses of Man. By Professor Bernstein, of the University of Halle. With 91 Illustrations. Second Edition. Crown 8vo. Cloth, 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. Cloth, 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. Cloth, price 6s. 6d.