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ENTOMOLOGY

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DISEA~ES TRANSMITTED BY THE COCKROACH 387Bacillus subtilis Ehrenberg, an organism frequently found in air,water, and soil, seldom pathogenic, was fed in three series of experiments,by Cao, in conjunction with other foods to starved roaches of Blattaorientalis. In two cases he obtained slight pathogenicity inducing localsuppurations but no killing of the experimental host.Baculus "tifosimile" Cao, a bacillus described by Cao resembling B.typh08U8, was isolated by Cli.O in three out of four series of experiment

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