Show t. t Impounded m P oun a Waters leis I Pest est Producers ro I r Those parts of or the country where the prevention of or malaria and mosquito mo reduction acute problems problems' are arc often orten faced raced with peculiar conditions which must be carefully considered be before before be- be fore foro adopting an any remedial measures One o of oC these problems now being studIed studied stud stud- led by the United States public health service is th the po possible relation of at certain tain tahl impounded waters which furnish the necessary power for Important in industries In- In n to the spread of or malaria The man many phases phase of oC this Tills situation have been discussed in a number of oC reports ono of oC which has haM Just lust been published b by the public health service This article deals with the tho Coosa river In the impounded water ex extending extending ex- ex tending for fOl about twenty miles upstream upstream upstream up up- stream from the dam In the area ex examined examined ex- ex the the- topo Is such that Vcr very little of oC tho the floating debris la is lacast cast catt upon the shore Pine Fine trees ar aro very ver numerous not only in the banks and loaded flooded flooded areas areas but also In inn the val val- cys of at streams ams and cn creeks that flow Into nto this artificial lake lags lal One of oC thu tho most Interesting observations 3 observations lions made was that th the tho leaves of at these pine trees olther when the they fell into the thu water or were carried Into It by streams coll collected into groups an and af afforded afforded afforded af- af forded excellent protection p for mosquito to larvae lanne forming In ha fact the most important im important important im- im local factor in n the production of or mosquitoes and being belm- far more In Influential in- in in hi this respect at least In tho the late ato autumn than floating logs Jogs As 1 observed el elsewhere it was WaH noticed that whenever to top feeding ln minnow were wert abundant they disposed of at all mosquito all tulto larvae a arvae and thus prevented thus prevented tho the develop develop- Jn nt of at mosquitoes Those fish wore wert in most parts part of oC the lakE examined perhaps on account o or of ortho the ho fact that larger fish which pre prey minnows were here cr very plentiful the Tho Influence cc of ot impounded waters waterson on the breeding lIn of mosquitoes and the tho consequent spread of malaria Is II a a. lon lion calling for f r prolonged ed studies aim anal It t is the intention of the public pubic health cr to continue Ita its |