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The book closes with a most instructive geological description of the soils of the cities of Berlin, Paris, Munich and Vienna, indicating the relations of soil and subsoil, of water and ground water and their circulation under different circumstances and how they might influence the health of these great cities and suggesting possible remedies in such cases. 
The author of the book indicates the lines along which hygienic research must be pursued in order that such research be attended with success and suggests a number of problems yet awaiting their solution.
A thorough chemical and biological investigation of the soil, subsoil, water and ground water of the larger cities of our great country, especially the capitol Washington, would form an excellent theme for the Museum of Hygiene to work upon.
In returning the book and, hoping I have