late Vice-President Entomological Society, London. To which are added Translations of Papers by Fritz Müller on the Scent-Organs of Butterflies and Moths; with a Note by E. B. Poulton, D. Sc., F. R. S. With 16 Plates (7 colored). 8vo, pp. xx+1+728. $7.00 net. (Postage 22 cents.) "Interesting descriptions of the general features of the countries visited, their history, geography, flora and inhabitants ... will appeal as much to those interested in travel as to the naturalist, as it is delightful reading.... It is the kind of book that helps make naturalists and we can't have too many of them.... The Appendix consists of translations of valuable papers by Fritz Müller, and is very useful and indispensable for those not understanding the original language. There is much to praise and nothing to condemn in the work, and it is a valuable addition to the popular works on natural history and travel."--Entomological News. =LONGMANS, GREEN & CO.= 443 Fourth Ave. New York ==================================================== _Gage_----The Microscope An Introduction to Microscopic Methods and to Histology By SIMON HENRY GAGE, Professor of Histology and Embryology Emeritus, Cornell University. Eleventh Edition, 375 pages; 265 Illustrations. Postpaid $2.00. This work aims to give help to everyone who uses the microscope, whether he is a beginner or an advanced worker. _Comstock_----A Manual for the Study of Insects By JOHN HENRY COMSTOCK, Professor of Entomology in Cornell University, and ANNA BOTSFORD COMSTOCK, member of the Society of American Wood-Engravers. 8vo. cloth, IX.+701 pages, 797 figures in the text, and six full page plates. Nearly all of the figures were engraved especially for this work. Postpaid $4.07; net $3.75. This handbook is designed to meet the needs of teachers in the public schools and of students in high schools and colleges. _Needham_----General Biology A book of outlines and practical studies for the general student By JAMES G. NEEDHAM, Professor of Limnology and General Biology in Cornell University. Cloth 8vo. XIV.+542 pages; 288 figures, mostly original. Postpaid $2.00. This book is expressly designed to help the general student obtain a comprehensive grasp of the principles of biology. _Comstock_----Handbook of Nature-Study By ANNA BOTSFORD COMSTOCK, Lecturer in Nature-Study in Cornell University. Cloth 8vo. XVIII.+938 pages, more than 1,000 illustrations. Prices, postpaid: Bound in one volume, $3.65; bound in two volumes, $4.50; Volume I., including Animal Life, $2.25; Volume II., including Plant Life, $2.25. Sample pages sent on application.