Excerpt from Military Geology and Topography: A Presentation of Certain Phases of Geology, Geography and Topography for Military Purposes

In addition to those furnished by the - authors many illustrations have been supplied by the Director of the United States Geological Survey. Electrotypes for nineteen illustrations appearing in Geology, by Chamberlin and Salisbury, and Physiography, by Salisbury, have been provided by Henry Holt and Company. John Wiley and Sons has given permission to use one illustration from Engineering Geology, by Ries and Watson, and the Harvard University Press has furnished an electrotype of one illustration from Handbook of Northern France, by William Morris Davis.

The task assumed by the authors has been a difficult one, for the relation of geology to military activities is unfamiliar to American stu dents, and the time available for the preparation of the text has been very brief. The aim has been to focus attention on those facts and principles that have proven to be applicable to military problems on the assumption that the teacher will develop the topics brie¿y treated and will supplement the descriptions in the text with models, maps, and lantern views. The book is the result of a preliminary effort, and its authors hope that it will be a nucleus about which will gather material for a more complete volume, it will have served its purpose if it increases the efficiency of the American Army even to a small degree, Teachers and other readers will aid in the preparation of an improved second edition by calling attention to errors, by suggesting emendations, and by furnishing general criticisms. Communications may be addressed to Professor Herbert E. Gregory, Yale University, New Haven, Conn.

National Research Council, Division of Geology and Geography, September 10, 1918.

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