Show TO KILL RILL PESTS WITH WAR WAit GAS I Experiments on the use of poison polson gases for exterminating obnoxious birds rodents and insects will wUl be undertaken undertaken undertaken un un- un- un I this fall by the U. U S. S bio blo- bIological biological logical survey In cooperation with the chemical warfare service The method wf will first be tried on blackbirds blackbirds black black- I birds in the Imperial valley of Ca Call Cali l- l fornia Cornia In that region we are told told lold by Chemical and Metallurgical Engineering Engineering Engineering En En- New York these birds are ate said to do at least OOOO worth of damage each Elch year It is Impossible ble to destroy them with poisoned baits but as they roost on the reeds In the marshes marshea it is thought that they ca can t be killed by a gas cloud a at night when the wind Is favorable Says the paper named above The blackbirds are migratory and return to the same places year ear after year It is thought that a big killing killing kill kill- ing in a certain locality will wUl probably free it of the pests for many years A few other birds in the blackbird blackbird- Infested marshes will be killed at the same time lime but the department believes believes believes be be- that these local birds will soon reach their normal numbers again Arrangements also are being made by the biological survey with the chemical warfare service for Investigating Investigating investigating gating the possibility of using poison poison poison poi poi- son gases on such ro rodents rodents rodents ro- ro dents as rats prairie dogs ground ground- squirrels and woodchucKs Tests on pocket gophers and squirrels ground-squirrels by bj- these two cooperating branches of the government in California show that chlorine may be used with good results If handled properly The chemical warfare service used phosgene phosgene phosgene gene on rats In Porto Rico with promising results Some of these war gases will wUl be compared with carbon carbon carbon car car- bon for the killing of or woodchucks and other rodents In their burrow burrows o |