M.D. (Vienna), M.R.C.S. (Eng.), L.R.C.P. (Lond.) _Cloth, 8vo, illustrated, $1.75_ _by mail, $1.87_ This book is the only one of its scope in the English language. It gives a popularly written yet scientific account of all that the average educated reader may desire to know about “Heredity and Kindred Subjects,” without assuming any knowledge of the subject on the reader’s part. * * * * * Heredity and Social Progress BY SIMON N. PATTEN, PH.D., LL.D. Professor of Political Economy, University of Pennsylvania. Author of “The New Basis of Civilization,” etc. _Cloth, 12mo, $1.25_ “With keen philosophic insight Professor Patten, in this book, probes to the roots of biology and plants there the foundations of economics and other social sciences. It is a bold deduction, wrought out with perfect logic, and shows one common principle active in every advance from the lowest unicellular organism to the highest social institution.”--_Annals American Academy._ “It is a book rich in suggestion and presents the subject in a clear and sometimes rather startling manner.”--_Ohio Farmer._ * * * * * Conduct and its Disorders Biologically Considered By CHARLES ARTHUR MERCIER, M.D., F.R.C.P., F.R.C.S., Physician for Mental Diseases to Charing Cross Hospital; Author of “A Textbook of Insanity,” “Criminal Responsibility,” etc. _Cloth, 8vo, xxiii + 377 pages, index, $3.23_ _by mail, $3.42_ Although Dr. Mercier’s work on _Conduct and its Disorders_ will be of special service to students of mental disease, the subject is one of such wide interest that other readers, less interested perhaps in its scientific aspects, will find the work full of suggestive information. The author points out that although conduct is what we are all engaged in, from birth to death, and though many departments of conduct are described in many books, there is not in existence, curiously enough, any comprehensive study of conduct as a whole--any general view of the field of human activity. It is this gap that Dr. Mercier has set himself to fill by the present work. The principle on which his exhaustive investigation has been made is the biological principle. He has estimated the various modes and phases of human activity in the light of their value in securing the survival of man in the struggle for existence. * * * * * Mendelism By R. C. PUNNETT, Fellow of Gonville and Caius College, Cambridge; Professor of Biology in the University of Cambridge. _New edition revised and enlarged. Cloth, 12mo, illustrated, $1.25_ _by mail, $1.38_