WHOLE VOL. APPLIED ENTOMOLOGY — HOWARD 175 



(6) A study of the Rocky Mountain spotted fever, a tick-borne disease. 



(7) Publication of a large number of reports giving the results of the work 

 of trained medical observers in the United States Public Health Service on 

 insect-borne diseases. 



(8) Publication of five general works on the subject of medical entomology, 

 as follows : 



Doane, R. W. Insects and disease. New York. 



Herms, W. B. Medical and veterinary entomology. New York. 



Riley, W. A., and Johannsen, O. A. Handbook of medical entomology. 

 Ithaca, New York. 



Pierce, W. D. Sanitary entomology — the entomology of disease, hygiene, 

 and sanitation. Boston. 



Chandler, A. C. Animal parasites and human disease. New York. 



It has become apparent in this extraordinary growth, and more 

 especially of late years, that the study of all aspects of entomology is 

 of the very greatest importance. We are realizing today that we must 

 know everything about insects, and that, therefore, the somewhat 

 arbitrary classification of entomologists into economic or general, or 

 " pure," is wrong, since in the last analysis all entomologists are 

 economic workers. 



Later Work in the States 



I rememljer very well that when Doctor Escherich's book entitled 

 " Die angewandte Entomologie in den Vereinigten Staaten " was 

 published, the Russian entomologist Emelianoff, who had been in the 

 United States for some time, criticised it by stating that in compari- 

 son with its full treatment of the Federal service it did not say enough 

 about the work done in the States, which was really quite as good and 

 quite as deserving of extended consideration. Emelianoff was right, 

 although as a matter of fact he himself had studied the State work and 

 not that of the Federal Government. But the fault was not Esche- 

 rich's. I have taken it on my own shoulders in my brief account of 

 the history of applied entomology in the United States published in 

 Doctor Friederichs' big recently published book entitled (translated) 

 " The Fundamental Questions and Legal Measures of Applied Zo- 

 ology in Agriculture and Foresty." I accompanied Escherich on his 

 journey through the States, and showed him, very naturally, the 

 things in which I was most interested, in which I had a personal con- 

 cern, although we did visit several State stations and he met a number 

 of the State workers. 



In just the same way I fear that I have laid myself open to criticism 

 in the present work. But I am not able to write as intelligently and 

 with as much detail concerning the growth of the science in the dif- 



