Experimental data relating to the destruction of B. abortus (2308) in milk by heat are presented.

It was observed that B. abortus (2308) was killed in 23 minutes at 142.7°F. and in 14 seconds at 161.6°F. when the preheating time was zero.

A practical mathematical method for evaluating the lethal effects of the preheating, holding and cooling parts of the heating curve on the organism is discussed.

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Author notes

*Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, The State University of New Jersey, Department of Dairy Industry.

Present address—Swift and Company, Research Department, Chicago, Ill.