Peary (1936), and Explorers of the Antarctic (1941); and also government and other reports and monographs. His published papers number 264 titles. Hobbs was in 1922 exchange professor at the University of Delft and in 1931 Russel lecturer at the University of Michigan (see Part II: Research Club) . He is a member of the American Philosophical Society. He organized and led three scientific expeditions to Greenland from the University in 1926, 1927-28, and 1928-29, and was director of another in 1930 — all chiefly for the study of glacial and meteorological conditions.
Professor Case has done his principal research work in the field of vertebrate paleontology, which has required collection of the material on exploring trips in various areas of the western United States. In all, no less than thirty of these arduous collecting expeditions have been carried through, and in 1923 he traveled throughout the world for study of Permian areas. Professor Case is today an authority on the vertebrate life of the Permian and Triassic ages. The published material has been brought out in eight monographs by the Carnegie Institution of Washington. These have been: No. 55, Revision of the Pelycosauria; No. 145, Revision of the Cotylosauria; No. 146, Revision of the Amphibia and Pisces of the Permian; No. 181, Permo-Carboniferous Vertebrates of New Mexico; No. 207, The Permo-Carboniferous Red Beds; No. 283, Environment of Vertebrate Life in the Late Paleozoic; No. 321, New Reptiles and Stegocephalians from the Upper Triassic; and No. 375, Environment of Tetrapod Life in the Late Paleozoic of Regions Other than North America. His published papers are represented by 144 titles. He is a member of the American Philosophical Society and was Russel lecturer at the University in 1934. He was in 1929 president of the Paleontological Society of America.
Frank Leverett, for a score of years (1908-28) Lecturer on Glacial Geology, is an outstanding authority on the Pleistocene glaciology of North America. This has been recognized by his election to the American Philosophical Society and to the National Academy of Science and by the conferment upon him of the honorary degree of doctor of science by the University of Michigan in 1930. His greater monographs, all published by the United States Geological Survey, include The Illinois Glacial Lobe (1899), Glacial Formations and Drainage Features of the Erie and Ohio Basins (1902), and (with Frank Taylor) The Pleistocene of Indiana and Michigan and the History of the Great Lakes (1915). His published papers number 170 titles.
Charles Wilford Cook (1908-33), Professor of Economic Geology, was a specialist on deposits of salt, oil, gas, and molybdenum minerals and published some nineteen scientific papers.
Laurence McK. Gould (1921-32), Instructor, Assistant Professor, and Associate Professor in the department, has played an important part in scientific exploration. He was geologist and second-in-command of the first University of Michigan Greenland expedition (1926), geographer and topographer and second-in-command of the Putnam arctic expedition (1927), and senior scientist and second-in-command of the first Byrd antarctic expedition (1928-30).
Lewis B. Kellum, Associate Professor of Paleontology (1928 — ), has directed six scientific expeditions to Mexico in the years 1930 to 1935. They have been devoted to a geological study of eastern Durango, southern and southwestern Coahuila, the San Carlos Mountains, and northern Zacatecas. The expeditions have been financed by grants from the National Research Council, the Geological Society of America, and the University of Michigan. Geologists from the faculties
