72 



THE HABITS AND BIONOMICS OF THE HOUSE-FLY 



district on both sides of the river. The papers were placed chiefly 

 in the kitchens of houses and were collected one or two days after 

 being distributed. They were usually collected in that portion of 

 the district towards which the wind had been blowing from the 

 direction of the island, as it was found that the wind was the chief 

 factor in determining the direction of the distribution from day to 

 day. 



EXPEEIMENTS. 

 Flies liberated on Porter's Island. 



As will be seen from the dates given, these experiments extend 

 over a short time only, having been terminated by the advent of a 



