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The author provides a fascinating look at the emerging science of bacteriology at the start of the twentieth century including early progress in understanding and preventing diseases such as tuberculosis and diphtheria. The book also includes chapters on the spread of disease through close contact with infected persons as well as from contaminated drinking water and milk. Water purification methods as well as the stability of various disease-causing organisms to extremes of heat and cold is discussed. The final chapter includes a very interesting discussion of the development of anti-venoms for the treatment of snake bite and related poisons.