102 REPORT OF NATIONAL MUSEUM, 1920. 



and a considerable quantity of very pure micaceous molybdite from 

 Chaffee County, Colorado, by the Molybdenum Mines Company, 

 1 >enver. 



From Mr. M. L. Patterson, manager of the Thabawleik mines. 

 Mergui, Burma, was received a collection of molybdenum, tin, am! bis- 

 muth ores, including a crystal of cassiterite of unusual size and per- 

 fection. A fine specimen of the rare tin mineral cylindrite, from 

 Bolivia, was donated by Messrs. Root and Simpson, Denver, Colorado, 

 and a somewhat unique specimen presented by the Bolivian delegates 

 to the Second Pan-American Financial Conference is a large sheet 

 of native copper from the Viscachani mine, Corocoro, which presents 

 in outline a very perfect similarity to that of the continent of South 

 America. Dr. J. Morgan Clements of New York, traveling in Ch 

 in the interest of the Federal Trade Commission, has forwarded fr mi 

 time to time materials of exceptional interest in the form of Chin 

 minerals, including magnesite, talc, asbestos, coal, magnetic iron ore, 

 and the noble serpentine which is so often cut and sold to the unwary 

 as jade. 



Mr. Hoyt S. Gale, formerly of the TJ. S. Geological Survey, has pre- 

 sented the Museum with a very fine series of saline minerals, includ- 

 ing thenardite and halite from Chile, and sylvite and associated salts 

 from the Amelie potash mines of Alsace. Rev. N. P. M. Corn of 

 Marshall, North Carolina, through Doctor Schaller, donated some 

 exceptional crystals of monazite, and the Geological Commission of 

 Finland transmitted in exchange granites and other rocks from Fin- 

 land, and fragments of the Bjurbole meteorite mentioned elsewhere. 



To the building stone collection were added five polished slabs >f 

 Tennessee marbles, each 2 by 5 feet, gift of the Gray Knox Ma role 

 Company, Knoxville, and 1'2 slabs, each 12 by 12 inches, of miscel- 

 laneous American marbles, gift of the Tompkins-Kiel Marble Com- 

 pany, New York. 



The meteorite collection has been enriched by the following addi- 

 tions: Two examples of the Colby, Wisconsin, stone, weighing 1,686 

 and 1,956 grams, received from the Public Museum of the City of 

 Milwaukee, and a 27-gram fragment of the Jerome, Kansas, stone, 

 from Dr. Henry S. Washington, are recorded as gifts. With the 

 exception of these and one purchase, that of a 3,320-gram piece of 

 the Yenberrie, Australia, iron, acquired from Mr. T. Watkin-Brown, 

 Sydney, New South Wales, all other additions to this collection were 

 obtained through exchanges, as follows: A 51-gram piece of the 

 Colby stone, from R. N. Buckstaff, Oshkosh, Wisconsin: two slabs 

 of the Cleveland, Tennessee, iron, from the Academy of Natural 

 Sciences, Philadelphia; a slice weighing 2,003 grams of the Wash- 

 ington County, Kansas, stone and a piece weighing 1,397 grams of 

 the Kesen, Japan, stone, from Ward's Natural Science Establish- 



