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The Effect of Distilled Water upon the Tendency to Colony Formation upon Petri Plates

College of Agriculture, University of California, Davis, California

ABSTRACT

The macroscopic colony count has been used for many years as a measure of the bacterial population of milk. In the numerous laboratories throughout the country it is considered the standard method, supported as it is, by the American Public Health Association. The first edition of Standard Methods mentioned only the plate method, which seemed to be adequate for the kinds of milk produced at that time. The numbers of bacteria found in milk were high as a rule, and one had but to separate the bad from the worse. In the four subsequent editions of Standard Methods other methods have claimed attention and obtained supporters, somewhat to the detriment of the plate method. Paralleling this diversity of methods there likewise has been an improvement in the milk itself, for there is no longer the large spread between milk of high and low quality. Such conditions place a greater tax upon the method which was devised primarily to eliminate the poorest milk.