抄録
The material on which the present paper is based was obtained from summer to winter of 1931 from various parts of the city of Tokyo and consists of 420 items. Of these 205 (48.8%) were found contaminated with Bacillus coli. In these, 50 (16%) were by E. coli. The other colon bacteria found in the material at our disposal are referable to other 7 species of Escherichia, 2 species of Alcaligenes, and Aerobacter. Not a single case of Bacillus typhosus was met with. Table 1 tabulates our results.
