230 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



observation affords in the writer's estimation the most satisfactory- 

 basis for experimental work. Having determined the physiological 

 differentiation of the organism, a histological test for structural differ- 

 entiation of sense organs can well be undertaken, and with these two 

 factors well in hand we have a splendid basis for practical control. 



References Cited 



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