1. A comparison has been made of the accuracy of the ordinary plate and Burri smear-culture methods for the determination of the bacterial content of milk samples.2. In determinations made by the smear-culture technique the percentage error has been shown to be markedly higher than in those made by plating.3. Evidence is presented in support of the view that the inaccuracy of the Burri method (as ordinarily employed) when compared with the plate technique is partly due to the errors involved in loop measurements and partly to the inferiority of the conditions for growth on slopes to those in plate cultures.

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It has been shown that oxygen can diffuse through oils used as sealants in the Oxidation—Fermentation test. Vaseline was shown to be the only satisfactory sealant.