36 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1920. 



Geology. — The additions to the collections in the department of 

 geology during the year were 180 lots against 135 for the year previ- 

 ous, with a decided increase in the number of specimens and their 

 scientific value. Of these accessions, 111 were gifts, 32 transfers, 25 

 exchanges, 2 were collections by members of the force, 1 received as a 

 deposit, and but 9 acquired by purchase. Among those of greatest 

 importance were gifts comprising ores of the rare metals, particu- 

 larly tungsten and molybdenum, secured chiefly through Mr. Frank 

 L. Hess, of the United States Geological Survey, an honorary cus- 

 todian in the Museum. The donors included Mr. C. W. Purington, 

 Vladivostok, Siberia ; Mr, J. G. Hibbs, Denver, Colo. ; the Homestake 

 Mining Co., Lead, S. Dak.; the R. & S. Molybdenum Co., Questa, N. 

 Mex. ; and the Molybdenum Mines Co., Denver. Other important ad- 

 ditions were made by Dr. J. Morgan Clerhents, of New York, travel- 

 ing in China in the interest of the Federal Trade Commission, and 

 Mr. M. L. Patterson, manager of the Thabawleik Mines, Mergui, 

 Burma. 



An excellent series of crystallized native copper and silver minerals 

 from the Lake Superior region was acquired by purchase and gift, 

 and a large slab of native copper, simulating in outline the continent 

 of South America, was received from the Bolivian delegates to the 

 Second Pan American Financial Conference. 



The meteorite collection was enriched by examples of the following 

 stones: Colby, Wis., 3,642 grams; Bjurbole, Finland, 2,500 grams; 

 Washington County, Kans., 2,003 grams; Kesen, Japan, 1,397 grams; 

 and Appley Bridge, 598 grams. In addition there was acquired 

 3,320 grams of an iron from Yenberrie, Australia. 



Valuable collections in the form of minerals and invertebrate fos- 

 sils, comprising many thousands of specimens, were received from 

 the United States Geological Survey, as was also a large series of 

 Igneous rocks from the Yellowstone National Park, described by 

 Dr. J. P. Iddings in volume 32 of its monographs. 



Large collections from the West Indies, particularly from the 

 Dominican Republic, have been added to the series of invertebrate 

 fossils, which have been further augmented by some 10,000 specimens 

 from the Upper Cambrian of Wisconsin. 



To the exhibition series have been added a large and unique speci- 

 men of trilobite, the largest American form in existence, which was 

 found during excavations in connection with the conservancy dam 

 at Dayton, Ohio; a mounted skeleton of the large, extinct mammal, 

 Brontotheriuni hatcheri; the sea-living lizard, Tyloscmrus proriger,' 

 and a diminutive camel Stenomylus hitchcocki. The study collec- 

 tions in vertebrate paleontology were augmented by a considerable 

 number of type specimens, deposited by the Maryland Geological 

 Survey, which, though fragmentary, are of primary interest. Of 



