174 THE HOUSE FLY— DISEASE CARRIER 



Ascaris eggs developed rapidly and were found in dif- 

 ferent stages of development in the insects, thus prov- 

 ing that the flies may serve as disseminators of the para- 

 site. "Provided that the eggs attained the proper stage 

 of development, the fly, acting simply as a carrier, 

 might convey the parasite to man by falling into, or 

 depositing its excreta on, the food." 



