Petrographic Methods and Calculations, with some Examples of Results Achieved

Abstract

DR. HOLMES has produced a text-book that is likely to have a far-reaching and beneficial effect in promoting the intelligent study of rocks. Some scientific treatises are patient compilations of the common stock of theories and facts current among specialists in the subject treated. If they are at least fairly accurate and reasonably up-to-date and complete they may be of great use to the student and research worker, even if they contain little or nothing that is original or noxfel. Others strike out a new and independent line of their own, and deal only with certain aspects of the subject on which the author feels he has a message to deliver. These, of course, have a value of their own, though they are not available as text-books or as works of reference. Petrographic Methods and Calculations, with some Examples of Results Achieved. By Dr. A. Holmes. Pp. xix+515+4 plates. (London: Thomas Murby and Co., 1921.) 31s. 6d. net.