Review: Bird Life; A Guide to the Study of Our Common Birds
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... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact firstname.lastname@example.org. SCIEVNCE. SCIEVNCE. mind when accompanied by a weathering of the rock, to be regarded as a secondary effect. All that Professor Merrill has to, say regarding the processes and products of weathering is timely and important. From the difference-in kind of weathering in cold and warm climates, a matter which has been studied by the geologists of India, it is pointed out that the study of the sedimentary rocks may be made to furnish a clue to past climates. It is to be regretted that there is not a chapter on the application of this principle to ancient rocks. The writings of Pumpelly, the work of Willis, Hayes, Campbell and others, together with the published evidence of ancient periods of base-levelling with peneplains and their complementary clastic records, constitute a basis for an interesting and valuable resu'me. As an extension to the treatment of the subject of rock-weathering in standard text-books on geology, this work can well be recommended to the student. For the student of agriculture and soil problems, it will probably give him as much of geology as he needs to know for practical purposes. The book is well illustrated with diagrams and photographic reproductions. The mechanical execution of the book leaves nothing to be desired. There is a fairly complete index of authors cited and of subjects.