Because of persistent rumors concerning the effect of type (ice bank or direct expansion) of farm bulk cooler upon the bacteriological quality of milk stored in them, certain data arising from another project were statistically analyzed to ascertain what variability might be expected from milk held in the two types under practical conditions. The data were derived from a study of nine different makes of coolers and twenty four shippers whose milk was sampled periodically during the winter and summer. This study showed that there was no statistically significant difference in the bacteriologcial qualty of the milk held in either type of farm bulk cooler.

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