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Change of Microflora of Two Starch Samples by Gamma Irradiation. Starch is the basic component of a larger number of manufactured food commodities. T h e disinfection of such a powder b y W o is considered here. Gamma irradiation of t w o starch samples with various contamination admits of the assumption that, in most cases, good radio-pasteurization can be obtained with 300 krad. The radio-pasteurization doses (varying from 300 to 600 krad) are a function o f the initial contamination. Irradiation effects are spectacular with moulds. Activation of spores o f some Clostridium species leads us to recommend an irradiation level higher than 200 krad. T h e most resistant organisms to gamma irradiation are the aerobic and anaerobic sporulated bacteria. i'he thermophilic forms are the most important. Spores of Bacillus chiefly Bacillus licheniformis and Bacillus brevis are the most encountered bacteria. At room temperature stocking irradiated starch has little effect upon the number o f revivable survivors. (Risume' d la page 8; Zusammenfassung Seite 8 )