518 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



turbans, but these five are the ones which must be mostly considered. 

 Minneapohs is well provided with swamps, and small ponds, which 

 are fast being filled or dredged out by the Park Board so as to be harm- 

 less from the mosquito standpoint, but there are many of these still 

 present in the newer parts and in the outskirts of the city. Places 

 which were formerly pot holes full of water are now dry, but dumping 

 is allowed in order to fill them for building purposes. These dumps 

 are full of receptacles which hold water throughout most of the sum- 

 mer and in the cooler months of spring and fall are a prolific source 

 of mosquitos. Sewer catch basins are another matter for considera- 

 tion, as well as rain barrels, for the women of Minneapolis insist on 

 collecting rain water as the city water is too hard for hair washing. 



It was felt that the first season's work must be in the nature of a 

 demonstration if we were to gain support from the public for such a 

 large undertaking as was ultimately contemplated. Accordingly, 

 eight square miles of territory were tentatively chosen in the lake 

 district of South Minneapolis in which conditions were typical for the 

 city and of more than usual difficulty for mosquito control, also where 

 the residents were of a class from which financial support could be 

 obtained. 



It would seem that it was an almost impossible task to isolate eight 

 square miles in the center of a city and free it of mosquitos. The 

 area was chosen with this in view. After the preliminary survey more 

 territory was added to the original eight square miles in order to render 

 the results surer, making a total of about ten square miles covered. 



It was not possible to get the work inaugurated sufficiently early to 

 catch the first spring brood of Aedes canadensis and sylvestris, but 

 the later broods were held in control. 



The ten square miles were divided into six districts and an inspector 

 placed in charge of each, A weekly inspection of every yard and 

 premise in the district was made. The season was of such a nature 

 that four sprayings of the swamps were sufficient, the inspectors being 

 taken from their other work and assigned to this work at the proper 

 intervals. The City Park Board agreed to spray all swamps on their 

 property, as did the Great Northern Railway and Lakewood Ceme- 

 tery which is situated on the southern boundary of the district. The 

 cemetery superintendent also saw to it that all flower vases were emp- 

 tied once each week. After the first spraying the Park Board ran 

 short of funds and turned the work back to the Real Estate Board. 

 This made our work very heavy for six men, for the swamps in the 

 Lake District are very extensive, one, the remains of an old tamarack 

 swamp, requiring three men a week to cover adequately with oil. 



