February, '19] headlee: sprinkling sewage filter fly 41 



fashion as to permit the fiUing of the bed in 12 hours and the mainte- 

 nance of the submergence for a period of 24 hours. 



The writer wishes to take this opportunity to acknowledge his in- 

 debtedness to Dr- Leonard Haseman for identification of species, to 

 the Joint Sewer Committee of Plainfield, Dunellen and North Plain- 

 field for substantial aid in carrying out the experiments, to Mr. John 

 R. Downes, superintendent of the disposal plant, for hearty coopera- 

 tion in the practical work of submergence and for furnishing data on 

 nitration, and to Mr. J. W. Thompson for making the drawings. 



President E. D. Ball: This paper is before you for discussion. 



Mr. W. a. Riley: I had the pleasure of seeing some of this work 

 last spring and was very much interested in the fact that while it had 

 not been estabhshed definitely that those flies were carriers of disease, 

 we have every reason to suppose that they would be under such cir- 

 cumstances, and I sympathize heartily with the people who brought 

 suit against the corporation for maintaining such a nuisance. I think 

 that Dr. Headlee's work will be very far reaching in its applicability. 

 For one thing, a little later I saw the filter beds and the system in 

 use here in Baltimore, or near this city. The beds of course are 

 enormously more extensive and the pest was just as serious here. 

 There have been a number of suits brought against the city and de- 

 cided adversely to the city here, and this certainly should be a matter 

 of much interest to the authorities in charge of that work. 



Another factor which impressed me especially in the beds here was 

 the number of other species of flies, including the house-fly, and a 

 number of the larger Muscids breeding in these beds. I did not see 

 that to any such extent at the beds in New Jersey, and that was very 

 apparent when I visited the sewer beds here. The problem for this 

 particular locality would make a very valuable and interesting one 

 for some one who has local opportunities to take it up. 



President E. D. Ball: Is there any further discussion? If not, 

 we will call for the next paper. 



THE OCCURRENCE OF DROSOPHILA LARViE AND PUPARIA 

 IN BOTTLED MILK 



By W. A. Riley, St. Paul, Minn. 

 (Withdrawn for publication elsewhere) 



President E. D. Ball: The next paper on the program is, 

 " Some Practical Phases of the Entomology of Disease, Hygiene, and San- 

 itation Developed by the War," by W. Dwight Pierce, Washington, D. C. 



