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This little book of 170 pages requires in this journal only mention of the topics discussed by it, as the article by Dr. Black published in number eleven of vol. iii, has already given the gist of the most original portion, and in regard to it the readers can judge for themselves.
The first half of the book gives a historical review of the germ theory of disease. It describes each important discovery and the methods of research adopted by each investigator. The last portion has been presented to our readers in abstract in the paper read by Dr. Black before the section on Practical Medicine and Materia Medica of the American Medical Association.
In the book before us four chapters or lectures are devoted to the consideration of the formation of poisons by micro-organisms. The first two treat of digestion and molecular changes incident to vitality; the third of