February, '17] CORY: CATTLE FLY PROTECTION ~ 111 



In addition to the tide-water marshes mentioned, several inland 

 areas have been rendered immune as regards the breeding of mos- 

 quitoes. For instance, in the town of Hamden near New Haven, some 

 swampy land is owned by the New Haven Water Company and the 

 Winchester Repeating Arms Company. The latter is now building a 

 dam and pumping station by means of which the water from about 

 fifty acres of land owned by this corporation may be pumped over the 

 dam into Lake Whitney. By raising the dam of this lake 18 inches 

 the New Haven Water Company will flood about fifty acres of its own 

 land. This treatment will prevent the breeding of mosquitoes on 

 about one hundred acres of fresh-water swampy land, now a prolific 

 source of malaria mosquitoes. 



Several projects are now under way for work next year. The city 

 of New Haven, for instance, has appropriated $10,000 for the purpose 

 of ditching all remaining marshes within its limits. 



It is evident, therefore, that Connecticut is making some progress 

 in solving her mosquito problems. 



President C. Gordon Hewitt: If there is no discussion, we will 

 now listen to a paper by Mr. E. N. Cory. 



THE PROTECTION OF DAIRY CATTLE FROM FLIES ' 



E. N. Cory, College Park, Md. 



In 1914 the herdsman of Maryland Agricultural Experiment Station 

 requested the writer to recommend a spraj^ suitable for protecting the 

 dairy cattle from flies. A spray of 6 per cent emulsion of pine tar 

 creosote was recommended and used with excellent results for the 

 balance of. that season and during the following summer. Previously, 

 proprietary coal tar products had been used, but several complaints 

 had been received to the effect that the butter made at the Station was 

 very perceptibly tainted with the coal tar odor. No complaints were 

 made of a similar nature after the pine tar creosote was adopted. 

 Personal examination of the butter showed no trace of creosote odor. 



In 1916, a project was outlined with the object of ascertaining the 

 minimum effective strength of pine tar creosote emulsion and the best 

 spraying procedure with special emphasis on the length of time a 

 single spraying was effective and the comparative value of morning 

 and afternoon sprayings. ^ 



1 Contribution from the Entomological Department of the Maryland Agricultural 

 Experiment Station. 



2 This project is in cooperation with the Department of Animal Husbandry of the 

 Maryland Agricultural Experiment Station. 



