Journal of Entomology and Zoology — Advertising Section 



GAGE — The Microscope 



^ An Introduction to Microscopic Methods and to Histology 

 By SIMON H. GAGE. 



Twelfth Edition. Entirely rewritten, and with many new illustrations. 

 Price, postpaid, $3.00. 

 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 Uni- 

 versity, 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 f3.75. 



This hand-book 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.-f542 pages; 288 figures, mostly 

 original. Postpaid $2.00. 



This book is expressly designed to help the general student obtain a com- 

 prehensive grasp of the principles of biology. 



NEEDHAM & LLOYD— The Life of Inland Waters 



A Text-Book of Frt-shwater Biology 

 By JAMES G. NEEDHAM, Ph.D., Professor of Limnology and General 

 Biology in Cornell University, and JOHN T. LLOYD, A.B., Assistant 

 in Limnology in Cornell University. 

 This book is a broad presentation of the field of fresh-water biology, 

 primarily in its scientific aspects, also in its relation to commercial, civic, 

 aesthetic and public health interests of man. There is no book in the Eng- 

 lish language covering the field. Copiously illustrated with photographs from 

 Nature. 438 pages; 244 figures. Price ?3.00. 



GAGE — Optic Projection 



By SIMON HENRY GAGE, Professor Emeritus of Histology and Em- 

 bryology in Cornell University, and Henry Phelps Gage, Ph. D. 



This work of over 700 pages and with over 400 figures is of especial inter- 

 est to workers in all fields of Biology in that it deals especially with the use of 

 the Projection Microscope for demonstrations and for drawing. It also gives 

 the fundamental principles of all the forms of projection. A 16-page circular 

 will be sent on request. Postpaid, $5.00. 



RILEY — Handbook of Medical Entomology 



By WM. A. RILEY, Ph. D., Professor of Insect Morphology and Para- 

 sitology in Cornell University and O. A. JOHANNSEN, Ph. D., Pro- 

 fessor of Biology in Cornell University. 

 A concise account of poisonous, and disease-carrying insects and their 

 allies, including descriptions and illustrations of the principal species, with 

 keys for their determination, and method of control. Bound Library Buckram, 

 medium 8vo. Nearly 375 pages. Price $2.00 net. 



Send for Descriptive Circular 



The Comstock Publishing Company 



Cornell Heights, Ithaca, N. Y. 



