When numerical estimates of microscopic clump counts are required the present standard method recommends examination of twice as many fields as when samples are merely graded. Alternate sequential grading procedures for two common grade limits have been developed for possible use where clump estimates are now required. Use of these procedures will yield grading results of a precision equal to that of the present recommended method concomitant with an average saving of at least 20 percent in the number of fields examined. Adaptability of the sequential procedure where the estimated clump counts of several samples of a producer's milk are averaged logarithmically during a grading period is discussed.

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Author notes

Dr. Max E. Morgan was graduated from the State College of Washington in 1939 and received his M.S. from the University of Connecticut in 1941. Upon return from Service as a bacteriologist in the U. S. Army Sanitary Corps he completed his Ph.D. in dairy bacteriology at Iowa State College in 1948. He is now Associate Professor of Dairy Manufacturing at the University of Connecticut.