74 REPORT OF NATIONAL MUSEUM, 1024 



Notable among the accessions of economic materials are Canadian 

 nickel and silver ores received from various sources. Frank L. 

 Hess secured and presented a large, fine exhibition example of 

 nickel ore showing masses of pentlandite embedded in pyrrhotite, 

 from the Creighton mine, Sudbury, Ontario, and, at his suggestion, 

 a mass of native silver and argentite from the Frontier mine, 

 Cobalt, was donated by M. F. Fairlie, of the Mining Corporation of 

 Canada. A series of carefully selected polished specimens illustrat- 

 ing the mineralogy and genesis of the cobalt-nickel-silver ores of the 

 Cobalt district was prepared by the Royal Ontario Museum of 

 Mineralogy for exhibition at the meeting of the Geological Society 

 of America held at Washington in December. Each specimen was 

 accompanied by a natural-sized photograph upon which each mineral 

 is indicated. This ' very interesting and instructive exhibit was, 

 after the meeting, turned over to the Museum, and has been used 

 as the nucleus for a special exhibit of the ores of that remarkable 

 area, now nearly exhausted. 



A more comprehensive exhibit of the occurrence of the diamond 

 than that already installed was made possible through the assistance 

 of EL D. Miser, of the United States Geological Survey, in securing 

 a very complete series of the diamond-bearing rocks of the Arkansas 

 mines, which has been installed in a case adjacent to the Gardner 

 Williams collection from South Africa. This makes possible a 

 direct comparison of the rocks of the two fields. The Arkansas 

 collection is accompanied by copies of the photographs of the region 

 used by Messrs. Miser and Ross to illustrate their report. 



Victor C. Heikes has continued to contribute to both mineral and 

 ore collections. Through his instrumentality there were received 

 arsenic ores from the Gold Hill mine, Tooele County, Utah, donated 

 by Samuel M. Soupcoff, of Salt Lake City, and, as a gift from 

 Robert N. Bell, also of Salt Lake City, two interesting specimens 

 showing native silver in curved wires and columns resting upon 

 cerussite crystals lining cavities due to the leaching out of argentif- 

 erous galena. The United Mercury Mines Co. presented a piece of 

 pure stibnite from their mines near Yellow Pine, Idaho, and a 

 crystallized example of the same ore was presented by the White 

 Caps Mining Co., Tonopah, Nev. Four large exhibition specimens 

 of antimony were obtained from H. G. Clinton, Manhattan, Nev., 

 as an exchange. 



As supplemental to the special exhibit of Franklin Furnace, N. J., 

 zinc ores, there was secured from the New Jersey Zinc Co. a series 

 of the concentrates obtained from the ores by the electromagnetic 

 process. 



