XXVI. =The Human Species.= By Professor A. de Quatrefages. Third Edition. Crown 8vo, _5s._
XXVII. =Modern Chromatics.= With Applications to Art and Industry. By Ogden N. Rood. With 130 original Illustrations. Second Edition. Crown 8vo, _5s._
XXVIII. =The Crayfish=: an Introduction to the Study of Zoology. By Professor T. H. Huxley. With 82 Illustrations. Third Edition. Crown 8vo, _5s._
XXIX. =The Brain as an Organ of Mind.= By H. Charlton Bastian, M.D. With numerous Illustrations, Third Edition. Crown 8vo, _5s._
XXX. =The Atomic Theory.= By Prof. Wurtz. Translated by G. Cleminshaw, F.C.S. Third Edition. Crown 8vo, _5s._
XXXI. =The Natural Conditions of Existence= as they affect Animal Life. By Karl Semper. With 2 Maps and 106 Woodcuts. Third Edition. Crown 8vo, _5s._
XXXII. =General Physiology of Muscles and Nerves.= By Prof. J. Rosenthal. Third Edition. With Illustrations. Crown 8vo, _5s._
XXXIII. =Sight=: an Exposition of the Principles of Monocular and Binocular Vision. By Joseph le Conte, LL.D. Second Edition. With 132 Illustrations. Crown 8vo, _5s._
XXXIV. =Illusions=: a Psychological Study. By James Sully. Second Edition. Crown 8vo, _5s._
XXXV. =Volcanoes: what they are and what they teach.= By Professor J. W. Judd, F.R.S. With 92 Illustrations on Wood. Second Edition. Crown 8vo, _5s._
XXXVI. =Suicide=: an Essay in Comparative Moral Statistics. By Prof. E. Morselli. Second Edition. With Diagrams. Crown 8vo, _5s._
XXXVII. =The Brain and its Functions.= By J. Luys. With Illustrations. Second Edition. Crown 8vo, _5s._
XXXVIII. =Myth and Science=; an Essay. By Tito Vignoli. Crown 8vo, _5s._
XXXIX. =The Sun.= By Professor Young. With Illustrations. Second Edition. Crown 8vo, _5s._
XL. =Ants, Bees, and Wasps=: a Record of Observations on the Habits of the Social Hymenoptera. By Sir John Lubbock, Bart., M.P. With 5 Chromo-lithographic Illustrations. Sixth Edition. Crown 8vo, _5s._
XLI. =Animal Intelligence.= By G. J. Romanes, LL.D., F.R.S. Third Edition. Crown 8vo, _5s._
XLII. =The Concepts and Theories of Modern Physics.= By J. B. Stallo. Second Edition. Crown 8vo, _5s._
XLIII. =Diseases Of the Memory=; An Essay in the Positive Psychology. By Prof. Th. Ribot. Second Edition. Crown 8vo, _5s._