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Abstract
Abstract 1.1. Physical properties and gross chemical analyses are of secondary importance in estimating the bacteriologic availability of peptones. More valuable information is given by determination of the protein hydrolysis products present. 2.2. Comparative values of practical importance are best furnished by certain biologic tests permitting of quantitative estimation. These are the elaboration of diphtheria and tetanus toxins, and to a lesser extent, the production of indol. 3.3. Domestic peptones furnish satisfactory tetanus toxin, but are unable to give a potent diphtheria toxin,—a property possessed by Witte's peptone. Indol producing power is shown by some of the domestic products as well as by Witte's peptone. 4.4. An experimental peptone is described which answers all the requirements of bacteriologic use, including the production of diphtheria and tetanus toxins, possessing superior activity.
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