1 62 Field Museum of Natural History — Reports, Vol. V. 



as follows: Through a fund generously donated by Mr. William J. 

 Chalmers, about sixty specimens of crystals have been added to the | 

 Chalmers collection. Up to this time this collection, which was first 

 exhibited at the Paris Exposition of 1900, had received only a few 

 additions, but the increase made this year and the announced inten- | 

 tion of Mr. Chalmers to continue its active enlargement, will result 

 in forming a very superior collection. Among the specimens added 

 to the collection this year was a well-formed octahedron of diamond 

 from South Africa nearly an inch in length and weighing 2o9/i6 carats. 

 Through the kind offices of Mr. Chalmers also, a donation of 108 speci- 

 mens of the copper ores and minerals of the Chuquicamata district in 

 Chile was received from the Chile Exploration Company of Chuqui- 

 camata, Chile. The series presented includes specimens of oxide ores from 

 the veins, sulphide ores from the veins, and oxide, siilphide and mixed 

 ores from the steam-shovel workings. Chalcocite, enargite, chalcopy- 4 

 rite, bornite, malachite, cuprite, brochantite, krohnkite and atacamite 

 are among the minerals represented. By thus affording a representation 

 of the ores of one of the most notable copper districts of the world, 

 this series forms an important addition to the collection. Mr. W. J. 

 Chalmers was also instrumental in securing from the St. John del Rey 

 Mining Company, Ltd., of Morro Velho, Brazil, through Mr. George 

 Chalmers, Superintendent, a series ntimbering about forty specimens, 

 of the ores and rocks of some of the chief gold mines in Brazil. The 

 series received included typical ores and rocks of the Morro Velho 

 mine, well known as the deepest gold mine in the world; a full repre- 

 sentation of the gold and iron ores of the Gongo Secco and Serro do 

 Ciirral mines showing especially the peculiar itabirite and jacutinga 

 ores; and specimens of gold ores and coimtry rocks from the Cuyaba 

 and Raposos mines. Full descriptions and a map accompanied the 

 specimens. These series add much of value to the Musevim ore coUec- || 

 tions. A large collection containing many attractive specimens, con- 

 sisting chiefly of copper minerals from mines in the Lake Superior 

 district, but including also important specimens of Arizona copper 

 minerals. Cripple Creek gold ores, etc., was presented by Nathan F. 

 and Alfred F. Leopold. A specimen of sheet copper partly removed 

 from the matrix, a sickle-shaped mass of copper over two feet in length 

 showing many crystal planes, and an unusual specimen of malachite, 

 are perhaps the most remarkable things in the collection. There are 

 also included specimens of many kinds of occurrences of native copper, 

 many of them crystallized, of calcite and copper, tellurides of gold, 

 arsenides of copper, amethyst, etc. As many of the specimens were 

 obtained from mines or localities no longer accessible, they have an 



