XXX. The ATOMIC THEORY. By Professor A. Wurtz. Translated by E. Cleminshaw, F.C.S. Seventh Edition.
XXXI. The NATURAL CONDITIONS of EXISTENCE as they affect Animal Life. By Karl Semper, Fifth Edition. With 2 Maps and 106 Woodcuts.
XXXII. GENERAL PHYSIOLOGY of MUSCLES and NERVES. By Prof. J. Rosenthal. Fourth Edition. With 75 Illustrations.
XXXIII. SIGHT: an Exposition of the Principles of Monocular and Binocular Vision. By Joseph Le Conte, LL.D. Third Edition. With 132 Illustrations.
XXXIV. ILLUSIONS: a Psychological Study. By James Sully. Fourth Edition.
XXXV. VOLCANOES: what they are and what they teach. By John W. Judd, F.R.S. Fifth Edition. With 96 Illustrations.
XXXVI. SUICIDE: an Essay on Comparative Moral Statistics. By Professor H. Morselli. Third Edition.
XXXVII. The BRAIN and its FUNCTIONS. By J. Luys, Physician to the Hospice de la Salpétrière. With numerous Illustrations. Third Edition.
XXXVIII. MYTH and SCIENCE: an Essay. By Tito Vignoli. Fourth Edition.
XXXIX. The SUN. By C. A. Young, Ph.D., LL.D. Fifth Edition. With numerous Illustrations.