66 



they are most common just below the vent. Each bird must be treated 

 separately by dusting, by applying grease or mercuric ointment, or by 

 dipping. An effective dusting powder may be made by mixing together 

 3 parts gasoline and 1 part crude carbolic acid (90-95 per cent, 

 strength). If the latter cannot be obtained, 3 parts gasoline and 1 

 part cresol should be taken and mixed together, enough plaster of 

 Paris being then added gradually, while stirring, to take up all the- 

 moisture. This powder should be worked thoroughly into the feathers. 

 Greasing the head and under the ^^^ngs with lard is the method usually 

 adopted with young chickens. For older birds, mercuric ointment 

 (1 part), mixed mth vaseline (2 parts), should be well rubbed into the 

 skin below the vent and under each wing, care being taken not to leave 

 it in lumps upon the feathers for fear of poisoning. 



For mature birds, a quicker and more satisfactory method is that of 

 dipping, which is quick and inexpensive but cannot be used in the case 

 of table poultry, as the odour remains in the feathers for months and 

 imparts a disagreeable flavour to the flesh. Any of the sheep or cattle 

 dips can be used, provided that the solution is rather weak, heated 

 to a temperature of 60° F., and that the operation is carried out on a 

 warm day. 



Howard (C. W.). A Demonstration in Mosquito Control. — Jl. Econ. 

 Entom., Concord, N.H., x, no. 6, December 1917, pp. 517-521, 



This paper describes a campaign undertaken in Minneapolis for the 

 purpose of ridding at least one part of the town from mosquitos, 

 though they have not carried malaria or any of the mosquito-borne 

 diseases to either Minneapolis or Minnesota, in spite of the fact that 

 both Anopheles maculipennis and A. punctipennis are present. Other 

 species constituting troublesome pests in these cities are Aedes 

 canadensis, A. sylvestris, Culex pipiens, C. restuans and C. tarsalis, 

 with several of minor importance such as Taeniorhynchus {Mansonia) 

 2)erturbans. 



The plan followed was to select some ten square miles in the Lake 

 district of south Minneapolis and work on this as a demonstration in 

 order to gain support from the pubhc for the larger undertaking that 

 was contemplated. The work was begun in June, too late for the 

 control of the first spring brood of A. canadensis and A. sylvestris, but 

 the later broods were held in check. A weekly inspection of every 

 yard and premises in the district was made and the swamps sprayed 

 four times during the season. Every attempt was made to eliminate 

 breeding-places and to interest the pubhc in rendering assistance. By 

 1st August few mosquitos were left ; screens to doors and windows 

 ceased to be a necessity and the pest was no longer troublesome. 



As a demonstration of the possibilities of mosquito control under 

 city conditions the campaign was a marked success, and shows what 

 can be done when the work has been well planned and carefully carried 

 out by capable inspectors. The area chosen was one of the most 

 difficult parts of the city in which to carry out control work, and a 

 prehminary survey confirms the opinion that the entire city could be 

 practically freed from mosquitos at small cost, while the reduction of 

 house-flies could be also undertaken by the same staff of insiDCctors. 

 With flies and mosquitos under control, many sources of disease would 



