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the wat herein reported supersedes that of Report L.Ael.RD. #6 lbeu oafleto in data ane found, The present reults have 'beem obtained I a zm type of oheber where the 1eagh of mepswre oa be eatir'~1y oontrolloe and ohweas in amsnatiofl mad. a mutter of a mooad* The minimua lethal oonceatritIon of phomse for dogs by Lahaat Ion In a *S&-air mixzture Is reported for the following periodsa of gMoswmo Dwasmre oao.Ln huhl-CT of Dogs in Imni-m ne L. onetumo Uned 30 16.19 8.1 to 60 6041 0.114 28 Igo (3 min.) 101 4.53 2 300 (6 ala.' 0.80 4.25 2 450 (7-k in.) 0.62 4065 23 OCT U ovaentration, altipliod by tisn* 0 Is orpressed in milligramn per Liter and T In uwtnuteso MWare to phOSWAS "WNb irAitioM of the ezpoei menus wevras loading. to lawaoxtI0n, malivationo eNd iumseed =992 MSeretlon 701201196 NVOBWO Nor profound effects Nas as pnefue sml beorstiov4 soe~amtivitio, "ad repirtory d1ta-Oattle 47e Wt~ds ZGath uSMij eOWUrf withla #A hour# sad the 1kin ONSs puiolog~ool 91aftvgo eae edema homrshxpt somistimea atelee tee I. amd equeinm of the lMge, hypwe*hsrz * diatation ef I * IIR JOW XO. .