W. A. KELLERMAN, COLUMBUS, OHIO -------------- American Entomological Co. 1040 DE KALB AVENUE, BROOKLYN, N. Y. Lepidoptera Price List No. 2.—_Price 5 cents_ (Refunded to Buyers) ISSUED NOVEMBER 15th 1900. Dealers of all kinds of _Entomological Supplies_ Manufacturers of the Original and Celebrated SCHMITT INSECT BOXES. _Builders of INSECT CABINETS, ETC._ ------------------------------------------------------------------------ The Twentieth Century Text Books of Biology. PLANT RELATIONS, 12mo, cloth $1.10 PLANT STRUCTURES, 12mo, cloth 1.20 PLANT STUDIES, 12mo, cloth 1.20 PLANTS, 12mo, cloth 1.80 ANALYTICAL KEY TO PLANTS, 12mo, flexible cloth .75 All by JOHN MERLE COULTER, A. M., Ph. D., Head of Dept. of Botany, University of Chicago. _They are already the preferred texts, and the reasons will be apparent on examination._ ANIMAL LIFE: A First Book of Zoology. By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., President of the Leland Stanford Junior University, and VERNON L. KELLOGG, M. S., Professor in Leland Stanford Junior University. 12mo. Cloth, $1.20. _Now ready._ _Not a book for learning the classification, anatomy, and nomenclature of animals, but to show how animals reached their present development, the effects of environment, their place in Nature, their relations to one another and to the human race. Designed for one-half year’s work in high schools. Send for sample pages._ ANIMAL FORMS: A Second Book of Zoology. By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., and HAROLD HEATH, Ph. D., Professor in Leland Stanford Junior University. _Ready in February, 1901._ -------------- =D. APPLETON AND COMPANY, Publishers=, _New York_, _Chicago_, _London_. -------------- RECENT SCIENTIFIC WORKS