Show C S a t r White Mice ice Serving In n Chemical Tests Insecticide Shower Evaluates Formulae Fo An style old phonograph rigged up to give a revolving shower bath to a white mouse is helping test new chemicals for effectiveness in instable instable stable fly control The mice are arc pinch hitting for dairy cows in making the tests says the US U.S. de department department de- de of agriculture The old phonograph was one that played wax cylinder records The test mouse is confined in a screen cage that replaces the old record holder The mouse is rolled around coy fW Y 1 I In n III several times under a sprayed solution of the new chemical and then is rolled under an air stream until dry The test comes the next day in another cage with 20 stable flies If as many as four of the flies succeed in attacking the mouse without being driven off oU or poisoned the chemical is not regarded regarded regarded re re- re- re as worth a full tull scale test teston teston teston on a cow This is the first time white mice have been used in just this kind of experimental work Federal entomologists are arc searching searching searching search search- ing actively for a spray that will protect animals from atta attack k by stable flies and other sucking blood flies rues and mosquitoes Recent experience experience experience ex ex- has proved abundantly how profitable it is for farmers to protect cattle from the torment of fly time and thus avoid the summer summer summer sum sum- mer slump in milk production ion and gains in weight of animals on pasture This search calls for trials of hundreds of chemicals Many of these are new synthetics |