REPORT OF NATIONAL MUSEUM, 1915. 79 



duce in models the occurrence and technology of asphalt, including 

 a very remarkable model of the famous Pitch Lake on the Island of 

 Trinidad, Another exhibit, in course of preparation by the National 

 Lead Co., of New York City, and soon to be completed, will repre- 

 sent by means of models the occurrence and mining of lead ore, as 

 well as the processes involved in the smelting of this ore to obtain pig 

 lead, and in the manufacture of white lead, etc., from pig lead. 

 Models illustrating the occurrence, mining and preparation of zinc 

 ore and the manufacture of metallurgical products typical of the in- 

 dustry, developing also the historical features together with the 

 part played by zinc in domestic economy, are being constructed under 

 the supervision of Mr. George C. Stone, as a donation from the 

 New Jersey Zinc Co. 



In cooperation with the United States Steel Corporation, the divi- 

 sion has under consideration plans for an exhibition covering the 

 occurrence, mining and milling of iron ore and the metallurgical 

 practices employed in the manufacture of iron and steel, which it is 

 expected will surpass any in the world for comprehensiveness and 

 details. The systematic series, in course of development to illustrate 

 in model form the general methods of ore extraction, is to receive 

 from the Geological Survey at the close of the Panama-Pacific Expo- 

 sition two excellent models showing both deep and shallow i)lacer 

 mining methods as practiced in Alaska. Two model exhibits under 

 construction at the close of the year, from designs by the division, 

 will illustrate, respectively, the occurrence, extraction and refining 

 of oil and gas, and an occurrence of natural sulphur and the method 

 of extracting it, as followed by two companies in this country. 

 Another exhibit, planned for early construction, will demonstrate 

 an occurrence of limestone, its quarrying and treatment in the 

 manufacture of Portland cement. 



DISTRIBUTION AND EXCHANGE OF SPECIMENS. 



The distribution of material to schools and colleges for teaching 

 purposes aggregated 14,843 duplicate specimens, accurately classified 

 and labeled, of which 10,774 were in series regularly prepared for 

 this jDurpose, as follows, namely: 64 sets of minerals and ores of 83 

 to 86 specimens each; 9 sets of rocks, minerals and ores of 72 to 74 

 specimens each; 21 sets of fossil invertebrates of 42 to 54 speci- 

 mens each; and 21 sets of moUusks of 174 specimens each. The 

 remaining 4,069 specimens were contained in 48 sets prepared to 

 meet special requirements and represented the subjects of ethnology 

 and archeology, mammals, birds, fishes, insects, marine invertebrates, 

 rocks, ores, minerals and fossils. In making exchanges 7,927 dupli- 

 cate specimens were used, of which 1,286 were anthropological, 907 

 zoological, 5,008 botanical and 726 geological, including fossils. 



