. The Canadian field-naturalist. May, 1927] The Canadian Field-Naturalist 115 BOOK REVIEW Our Mobile Earth by R. J. Daly Charles Scribnei's Sons, 1926. This is a new book on Intrageology by Reginald Aldworth Daly, Sturgis-Hooper Professor of Geology, Harvard University. Professor Daly is a Canadian by birth, a graduate of Toronto University, and one of the foremost living geolo- gists. He is the author of a number of reports published by the Geological Survey of Canada, the chief of which is the "Geology of the North American Cordillera at the Forty-Ninth Parallel", in three parts. H
. The Canadian field-naturalist. May, 1927] The Canadian Field-Naturalist 115 BOOK REVIEW Our Mobile Earth by R. J. Daly Charles Scribnei's Sons, 1926. This is a new book on Intrageology by Reginald Aldworth Daly, Sturgis-Hooper Professor of Geology, Harvard University. Professor Daly is a Canadian by birth, a graduate of Toronto University, and one of the foremost living geolo- gists. He is the author of a number of reports published by the Geological Survey of Canada, the chief of which is the "Geology of the North American Cordillera at the Forty-Ninth Parallel", in three parts. He is also the author of "Igneous Rocks and Their Origin" and numerous papers dealing with many phases of geology. He ori- ginated the theory of 'stoping" to account for the manner of intrusion of batholithic masses of igneous rock and many of his publications deal with this problem and its related one, that of magnetic assimilation and its effect in producing different types of igneous rocks. Intrageology or the science of the interior of the earth is one which is receiving more and more attention. In the present volume Dr. Daly summarizes in a most interesting and attractive way what is known about the interior of the earth and what is inferred from the known facts. The facts and the theories are, however, so intimately interwoven that the amateur reader will probably have difficulty in separating them. Earthquakes, volcanic activity, geologic structure and crustal movements all have a tale to tell bearing on the problem of what lies below the surface crust of the earth, and each is discussed in an equally interesting way. Daly believes that underlying the earth's crust everywhere is a hot, glassy ba- saltic substratum. This is under conditions of such high pressure that it acts as a rigid solid for sudden stresses while over long periods of time it yields sufficiently to allow the continents to stand in isostatic adjustment. When the pres- sure on it is locally
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