A procedure is described for accurately determining the diameter of bacteriophage plaques down to .05 mm in diameter.

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Author notes

1Journal Paper No. J-10192 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 2144.

2American Dairy-food Consultants, Inc. (ADC) 2460 South Broadway, Denver, Colorado 80210

3Research and Development, Leprino Foods Company, 1830 W. 38th Avenue, Denver, Colorado 80211.