in 



HANDBOOK OF MEDICAL ENTOMOLOGY 



Wm. A. Riley, Professor of Insect Morphology and Parasitology, and 

 O. A. Johannsen, Professor of Biology, Cornell University. 



_ A concise, up-to-date reference and text on parasitic and poisonous insects, espe- 

 cially those which transmit disease, with keys for determining the principal species 

 affecting man. Invaluable to entomologists, physicians and health officers. 



Bound in library buckram. 8vo. Now Ready. 350 pp. Fully Illustrated . 



Postpaid $2.20 



Prospectus on application. 



THE COMSTOCK PUBLISHING COMPANY :: Cornell Heights, ITHACA, N. Y. 



Protect Your Health-"Swat The Fly" 



IT IS A WELL KNOWN FACT THAT FLIES CARRY DISEASE; AN EASY 

 METHOD OF EXTERMINATING THE FLY IS AS FOLLOWS: 



INSTRUCTIONS : Prepare a solution of nine parts of water to one part of 

 FORMALDEHYDE, pour in a flat saucer, and add a teaspoonful of sugar. Place in 

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USE IT IN YOUR HOME 



FOR ALL USES OF Formaldehyde IN THE HOUSEHOLD AND OTHERWISE, ADDRESS 



Perth Amboy Chemical Works, 



100 WILLIAM STREET, NEW YORK. 



The above method is strongly recommended by physicians and such authorities as 

 the Chicago Board of Health. 



Be sure to specify Perth Amboy Chemical Works Formaldehyde when ordering 

 through your wholesale or retail druggist. 



**P. A. C. W." FORMALDEHYDE can now be secured in original 

 sealed 1-lb. bottles, at 35c. a bottle. 



Entomological Books For Sale 



A large number of books, reports, bulletins, etc., relating to 

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