Malaria : lessons on its cause and prevention : for use in schools / by H.R. Carter.

  • Henry Rose Carter
Date:
1914
Catalogue details

Licence: Public Domain Mark

Credit: Malaria : lessons on its cause and prevention : for use in schools / by H.R. Carter. Source: Wellcome Collection.

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    Third. The less brush left to shelter mosquitoes the better, 1 if they are exposed to the hot sun many of them die. (2) DESTRUCTION OF BREEDING PLACES. (a) Q. How do you destroy their breeding places? A. In two ways: (1) By draining or filling up the pools, marshes, etc., which they breed. (2) By oiling such pools as we can not drain or fill. (a) Q. How does draining or filling up pools prevent breedin A. By leaving no water in which they can breed. (a) Q. How does oiling the pools prevent breeding? A. It kills the larvae. (a) Q. How does it hill the larvae? A. The oil forms a layer on the surface of the water. Now, i larvae must have air to breathe even if they do live in the water, a they come to the top to get it, and as they can not get through t layer of oil to get air they die. Try it on a water barrel with wigg tails and see. (b) Q. How often should this oiling be done? A. Once in 12 or even 14 days would be often enough, but it is b done once a week on the same day of the week, so that it will not forgotten. Use enough oil (coal oil or kerosene) to form a layer over the surface, so that you can see it. (a) Q. Can all pools be oiled advantageously? A. No. If there be much grass in the pool the oil will not fora layer all over it. If the pool be large, that is a pond, the wind v blow the oil over to one side so that the surface on the other side is ] covered. On large pools and grassy pools oil can not be depended (a) Q. Is there any other way besides oiling in which the water pools, ditches, etc., can be made unfit for breeding Anopheles? A. Almost anything that makes the water foul and bad smelli will prevent Anopheles breeding in it, such as soapsuds, dyesti gas tar, refuse from mills, etc. (a) Q. What of water in barrels, drinking troughs, cans, etc.? A. Where water is often disturbed, as in chicken and horse troug Anopheles are not found or very rarely found; nor are they co monly found in barrels or in artificial containers of any kind, 1 they are sometimes, and if the water is not needed it is best to ti it out or oil it, as it may breed Anopheles, and will breed otl mosquitoes, which are a nuisance even if they do not give ( malaria. (a) Q. Have Anopheles larvae other enemies besides man? A. Yes. The “top minnows” that are so abundant in some of c small, sluggish streams eat large numbers of them. In places wb
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