Mosquitoes : how they live; how they carry disease; how they are classified; how they may be destroyed / by L.O. Howard.
- Leland Ossian Howard
- Date:
- 1902
Licence: In copyright
Credit: Mosquitoes : how they live; how they carry disease; how they are classified; how they may be destroyed / by L.O. Howard. Source: Wellcome Collection.
Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.
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![sene after from fifteen to twenty days, in order to render it impossible that any adult mosquito can be developed. This period is too short, rather than too long, but it is ab- solutely safe, and in any given locality observations will indicate to what extent it may safely be lengthened. I am quite inclined to believe that, even in tropical regions, seventeen-day intervals will be perfectly safe, if the fuel oil referred to above is used. My own. experiments were carried on with illuminating oil, and the fuel oil is more persistent. The first army orders issued in Cuba (Circular No. 8, Headquarters Department of Western Cuba, October 15, 1900) required the treatment of breeding-pools once a month. The second order (General Orders No. 6, Head- quarters Department of Cuba, December 21, 1900) re- quired the application of kerosene twice a month. The Winchester ordinance, it will be remembered, designates as the times of application once every three weeks, but the mayor suggests that the first and fifteenth clays of each month be oil days. As interesting records, the army circular and order are given .- {Circular No. 8.] Headquarters Department of Western Cuba, Quemados, October 15, 1900. The following communication from the Chief Surgeon is pub- lished for the information and guidance of commanding officers in this department. The necessary action will be taken as there- in recommended.](https://iiif.wellcomecollection.org/image/b21466506_0213.jp2/full/800%2C/0/default.jpg)
