XXVII. Modern Chromatics. With Applications to Art and Industry. By Ogden N. Rood. With 130 original Illustrations. Second Edition. 5s.
XXVIII. The Crayfish: an Introduction to the Study of Zoology. By Professor T. H. Huxley. With 82 Illustrations. Fourth Edition. 5s.
XXIX. The Brain as an Organ of Mind. By H. Charlton Bastian, M.D. With numerous Illustrations. Third Edition. 5s.
XXX. The Atomic Theory. By Prof. Wurtz. Translated by G. Cleminshaw, F.C.S. Fourth Edition. 5s.
XXXI. The Natural Conditions of Existence as they affect Animal Life. By Karl Semper. With 2 Maps and 106 Woodcuts. Third Edition. 5s.
XXXII. General Physiology of Muscles and Nerves. By Prof. J. Rosenthal. Third Edition. With Illustrations. 5s.
XXXIII. Sight: an Exposition of the Principles of Monocular and Binocular Vision. By Joseph le Conte, LL.D. Second Edition. With 132 Illustrations. 5s.
XXXIV. Illusions: a Psychological Study. By James Sully. Third Edition. 5s.
XXXV. Volcanoes: what they are and what they teach. By Professor J. W. Judd, F.R.S. With 92 Illustrations on Wood. Third Edition. 5s.
XXXVI. Suicide: an Essay on Comparative Moral Statistics. By Prof. H. Morselli. Second Edition. With Diagrams. 5s.