Summary An all‐glass aeration tube and improved air‐distributing apparatus are described for use in the Swift stability test or similar accelerated method of determining stability of fats. A procedure is described in which only one tube is required for each test sample. By this procedure, it is possible to carry out as many stability tests simultaneously on one standard apparatus as on three such units by the usual three‐tube method. Observations on the use of adaptations of Wheeler's method of determining peroxide values are reported. The effects of air, time of reaction, size of sample, and quantities of reagents were investigated.

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Summary The stability of lards containing various antioxidants was determined by the active oxygen method and by storage in glass vials at 21° C. In many instances there was general agreement in the results, but no constant relationship was found. The difference between the results of the rapid test and those of the storage tests seemed to be greatest when tocopherol concentrate and lecithin were added to lard. In most instances where antioxidants were used, the protection indicated by the rapid stability test was higher than that found in the storage test.

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