“Though a fact familiar to botanists, it is not generally known how great is the uncertainty as to the origin of many of the most important cultivated plants.... In endeavoring to unravel the matter, a knowledge of botany, of geography, of geology, of history, and of philosophy is required. By a combination of testimony derived from these sources M. de Candolle has been enabled to determine the botanical origin and geographical source of the large proportion of species he deals with.”—_The Athenæum._ _THE FOLK-LORE OF PLANTS._ By T. F. THISELTON DYER, M.A. 12mo. Cloth, $1.50. “A handsome and deeply interesting volume.... In all respects the book is excellent. Its arrangement is simple and intelligible, its style bright and alluring.... To all who seek an introduction to one of the most attractive branches of folk-lore, this delightful volume may be warmly commended.”—_Notes and Queries._ _FLOWERS AND THEIR PEDIGREES._ By GRANT ALLEN, author of “Vignettes of Nature,” etc. Illustrated. 12mo. Cloth, $1.50. “No writer treats scientific subjects with so much ease and charm of style as Mr. Grant Allen. The study is a delightful one, and the book is fascinating to any one who has either love for flowers or curiosity about them.”—_Hartford Courant._ “Any one with even a smattering of botanical knowledge, and with either a heart or mind, must be charmed with this collection of essays.”—_Chicago Evening Journal._ _THE GEOLOGICAL HISTORY OF PLANTS._ By Sir J. WILLIAM DAWSON, F.R.S. Illustrated. 12mo. Cloth, $1.75. “The object of this work is to give, in a connected form, a summary of the development of the vegetable kingdom in geological time. To the geologist and botanist the subject is one of importance with reference to their special pursuits, and one on which it has not been easy to find any convenient manual of information. It is hoped that its treatment in the present volume will also be found sufficiently simple and popular to be attractive to the general reader.”—_From the Preface._ _THE ICE AGE IN NORTH AMERICA, and its Bearings upon the Antiquity of Man._ By G. FREDERICK WRIGHT, D. D., LL. D. With 152 Maps and Illustrations. Third edition, containing Appendix on the “Probable Cause of Glaciation,” by WARREN UPHAM, F.G.S.A., and Supplementary Notes. 8vo. 625 pages, and complete Index. Cloth, $5.00. “Prof. Wright’s work is great enough to be called monumental. There is not a page that is not instructive and suggestive. It is sure to make a reputation abroad as well as at home for its distinguished author, as one of the most active and intelligent of the living students of natural science and the special department of glacial action.”—_Philadelphia Bulletin._ _THE GREAT ICE AGE, and its Relation to the Antiquity of Man._ By JAMES GEIKIE, F.R.S.E., of H. M. Geological Survey of Scotland. With Maps and Illustrations. 12mo. Cloth, $2.50.