3I0SQUIT0ES IN GENEUAL 27 



was free from mosquitoes, until tlirongli cars on the 

 railroads brought them up from the vicinity of New York 

 City. 



After the publication of this bulletin some doubt was 

 expressed by the newspaper reviewers of the importance 

 of this method of dissemination ; but confirmatory evi- 

 dence of a striking' character has since been gained, al- 

 though, as a matter of fact, the proposition was so self- 

 evident that it did not need confirmation. The interest- 

 ing community work undertaken ag-ainst mosquitoes by 

 the city of Winchester, Va., and which will be referred to 

 in detail in the chapter on remedies, has brought out the 

 fact that Winchester was at one time a favorite summer- 

 resort, and that mosquitoes were practically unknown, but 

 that with the estal)lishment of a night train on the Balti- 

 more & Ohio Railroad, running from Camden Station, 

 Baltimore, in the summer-time, mosquitoes began to be a 

 positive annoj^ance in Winchester. Unfortunately, with 

 the establishment of this night train, or about the same 

 time, Winchester extended its system of water-Avorks and 

 did not build sewers. As a result, with the arrival of the 

 mosquitoes from Baltimore there was a plentiful KU])])ly 

 of standing water all through the city, and conditions 

 were thus perfect for the (levelo[)ment of mosquitoes in 

 enormous numbers. 



Mr, C. A. Sperry, of Chicago, who formerly lived in 

 Mexico, has informed me that in the City of Mexico, be- 

 fore the railroads won? built to Tamjiico and Vera Cruz, 

 there were no moscpiitoes. They were brought u]i from 

 the coast, however, in the cars, and established them- 



