1 66 Journal of Agricultural Research voi. vi.no. 4 



gillus repens, A. flavus, and A. Jumigatus. The molds which sundve are 

 found only occasionally in milk. 



(2) The flash process of pasteurization, where milk was heated to 165° 

 F. (73.9° C.) for a period of 30 seconds, destroyed the spores of all the 

 molds tested with the exception of many spores of one form and occa- 

 sional spores of three more forms. At 175° F, (79.5° C.) only occasional 

 spores of two forms developed. 



(3) When the heating process was performed in dry air for a period 

 of 30 seconds at 200° F. (93.3° C), 31 out of 42 forms of Penicillium and 

 7 out of 24 forms of Aspergillus were destroyed, but none of the cultures 

 of the mucors. A temperature of 250° F. (121.1° C.) over a period of 

 30 minutes killed all the forms of Penicillium spp. tried, but left an 

 occasional living spore in one species of Aspergillus and three out of six 

 mucors. 



