Cope: Master naturalist. The Life and Letters of Edward Drinker Cope. With a Bibliography of his Writings classified by Subject. A study of the Pioneer and Foundation Periods of Vertebrate Palaeontology in America. BY HENRY FAIRFIELD OSBORN, Senior Geologist, U. S. Geological Survey; Honorary Curator, Department of Vertebrate Palaeontology, American Museum of Natural History. With the Cooperation of Helen Ann Warren [and others]. Illustrated with Drawings, and Restorations by Charles R. Knight under the Direction of Professor Cope. 1931. Princeton University Press, Princeton, N. J. (London: Humphrey Milford. Oxford University Press.) $5.00