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The Porter Lectures for 1949, given under the auspices of the University of Kansas School of Medicine, appear under the imprint of the University of Kansas Press in a neat and attractive volume. The three lectures given by Dr. Chester S. Keefer deal with the uses of penicillin and streptomycin, as well as other antibacterial agents from microbes. No one is better fitted to discuss this subject than Dr. Keefer, and his precise and lucid summary of the subject makes interesting as well as useful reading.