THE increasing use of the word ‘geomorphology’ may be regarded as symptomatic of the emancipation of the science from parental control; for as a hybrid science, the offspring of geology and geography, its early footsteps have hitherto been guided in the direction dictated by one or other of its parents, so that it was either ‘physical geography’ or ‘physical geology’. Now the science has its own journal, less than two years old, and a rapidly growing literature which is steadily developing its own technique, and a personality quite distinct from its parents. Geomorphology An Introduction to the Study of Landscapes. By Prof. A. K. Lobeck. Pp. xii + 731. (New York and London: McGraw-Hill Book Co., Inc., 1939.) 25s. A Textbook of Geomorphology By Prof. Philip G. Worcester. Pp. viii + 565.(London: Chapman and Hall, Ltd., 1939.) 22s. 6d.net.