REPORT OF NATIONAL MUSEUM, 1921. 75 
Commander C. D. Thurber, United States naval station, Pearl Har- 
bor, Oahu, Hawaii; and Capt. Edward L. Beach, commandant of the 
Mare Island Naval Station, Calif. As noted in previous reports, the 
study of fossil mollusks is so dependent on that of the recent forms 
that the paleontologists of the Geological Survey, notably Dr. W. P. 
Woodring, Dr. Julia A. Gardner, Mr. W. C. Mansfield, and Dr. C. W. 
Cooke spent considerable time studying material in the division of 
mollusks. 
The National Herbarium, as in previous years, is used frequently 
by many members of the scientific staffs of the Department of Agri- 
culture. In particular Dr. S. F. Blake, Dr. C. R. Ball, Prof. C. V. 
Piper, and Dr. W. E. Safford have given attention to several critical 
groups. Mr. Ivar Tidestrom has continued his work upon the plants 
of Utah and Nevada. 
RESEARCHES ELSEWHERE AIDED BY MUSEUM MATERIAL 
The liberal policy of the Museum in keeping its collections and 
laboratories open to visiting specialists and in sending out its mate- 
rial to scientific workers in this and other countries, as outlined in last 
year’s report, was continued during the present year to the mutual 
advantage of both parties. 
A number of prominent students visited the various divisions for 
longer or shorter periods, as shown by the following list: Mr. Rem- 
ington Kelloge used the cetacean and other osteological mammalian 
material; Mr. Herbert Lang, American Museum of Natural History, 
studied African squirrels; Mr. H. E. Anthony, of the same museum, 
South American mammals; Mr. R. M. Anderson, Geological Survey of 
Canada, specimens of caribou. The bird collections, besides being 
freely used by members of the staff of the Biological Survey, were 
examined by Dr. W. B. Alexander, Perth, West Australia; Dr. 
Stanley C. Ball, Bishop Museum, Honolulu, Hawaii; Maj. Allan 
Brooks, Okanagan Landing, British Columbia; Dr. H. C. Bryant, 
Museum of Vertebrate Zoology, Berkeley, Calif.; Mr. James P. 
Chapin, American Museum of Natural History, New York; Mr. 
H. K, Coale, Highland Park, Ill.; Mr. Donald R. Dickey, Pasadena, 
Calif.; Dr. Jonathan Dwight, New York City; Mr. J. H. Fleming, 
Toronto, Canada; Dr. Joseph Grinnell, director of Museum of Ver- 
tebrate Zoology, Berkeley, Calf.; Mr. Ludlow Griscom, American 
Museum of Natural History, New York; Mr. A. K. Haagner, Pre- 
toria, Transvaal; Mr. Romeyn B. Hough, Lowville, N. Y., Rev. 
H. W. Hubbard, Peking, China; Mr. M. J. Kelly, Everhart Museum, 
Scranton, Pa.; Mr, F. H. Kennard, Newton Center, Mass.; Mr. H. 
Matsumoto, N. E. Imperial University, Sendai, Japan; Mr. W. De W. 
Miller, American Museum of Natural History, New York; Mrs. M. M. 
Nice, Norman, Okla.; Dr. W. H. Osgood, Field Museum of Natural 
