EXPLANATION OF PLATE III. 



Diagram showing Arrangement of Cases in Department of Geology, June 30, 1892. 



"West-south range. — No.l, wall-case containing collection of elements of rock-forming minerals, color, 

 structure, and fracture series; Nos, 2 to 10, inclusive, table-cases with slope-top cases contain- 

 ing systematic Beriesof rocks; No. 11, table-case with slope- top case containing volcanic mate- 

 rials; No. 12. floor-upright case with calcareous and siliceous deposits, from hot springs, gey- 

 sers, and extinct lakes; No. 13, hall' unit table-case with model of Vesuvius; No. 14, table-case 

 with slope-to]) case containing lavas from Ice Spring Buttes, Utah ; No. 15, table-case with 

 special top containing collections illustrating stratification and its accompaniments; No. 16, 

 door-screen case with type collections of rocks of Comstock, Lode and Washoe district, Neva da ; 

 No. 17, door-screen case with collections illustrating the geology and mineralogy of the District 

 of Columbia; No. 18, special base with large concretions from Cannon Ball River, Dakota; 

 No. 19, table-case with large masses of obsidian; No. 20, half unit table-case with blocks of 

 glacial polished and striated limestone; No. 21, wall-case containing series illustrating joints, 

 faults, veins, ami pressure effects; No. 22, wall-case containing concretions; No. 23, wall-case 

 containing collections illustrating (a) formation of pebbles by wave action on a beach, (b) the 

 drifting power of water, (e) effects of lightning (fulgurites), (d) rock decomposition and the 

 formation of soils, (c) contact metamorphism ; Nos. 24, 23, and 26, door-screen cases with build- 

 ing and ornamental stones ; No. 27, special case with large geyser cone; No. 28, floor-upright 

 case with stalactite and stalagmites; Nos. 29 and 30, table-case with relief maps; Nos. 31. 32, and 

 33, door-screen cases with building and ornamental stones; Nos. 34 and 35, table-cases with 

 building and ornamental stones showing style of dressing; Nos.36,37, and 38, door-screen 

 cases with building and ornamental stones; Nos. 39, 40,41, and 42, table-cases with ripple marks, 

 mud cracks, foot-prints, etc.; Nos. 4:1 to 48, inclusive, door-screen cases with building and 

 ornamental stones; No. 49, large block of glaciated limestone: No. 50, table-case with slope-top 

 case containing glacial exhibits; No. 51, relief map of Grand Canon District ; No. 52. table-case 

 with wing-frames for pictures; Nos. 53 and 54, relief-maps of the Uinta and Wasatch moun- 

 tains. Yellowstone. Park, high plateaus of Utah, and Mount Taylor, New Mexico; Nos.55 

 and 56, pier-cases with foreign building and ornamental stones; No. 57, pier-cases with col- 

 lections showing reproductive and constructive effects of plant and animal life, the geology 

 of Bermuda; No. 58, pier-cases witli collection illustrating the origin of serpen tinous rocks,- 

 No. 59. wall-case with rocks of New Hampshire: No. 60, wall-case with historical series includ- 

 ing type series of rocks of Canada: Nos. 61 and 62, columns of grindstones ; No. 63, table with 

 books for reference. 



South-west court.— Wall-cases : Nos. 1 to 54. inclusive, geographic series of ores and useful mineral 

 substances. 



Floor-cases and tables: No. 1, table with books for reference; Nos. 2 to 4, gold ores of 

 systematic series; Nos. 5and6, silver ores ; Nos. 7 and 8, silver lead ores ; Nos. 9 and 10, lead ores; 

 Nos. 11 to 16, copper ores; Nos. 17 to 20, Tenth Census collection of iron ores; Nos. 21 to 23, 

 iron ores; No. 24, manganese ores; Nos. 25 to 27, zinc ores; No. 28, antimony ores; Nos. 29 

 and 30. tin ores; Nos. 31 and 32, nickel and cobalt ores; Nos. 33 and 34, mercury ores; No.:;;,, 

 aluminum ores; No. 36, miscellaneous; Nos. 37 and 38, silver and its extraction; No. 39, lead 

 and its extraction; Nos. 40 to 42, copper and its extraction; Nos. 43 and 44, the manufacture 

 of steel; No. 45. iron and its extraction ; Nos. 46 and 47, zinc and its extraction; No. 48, mineral 

 pigments, detergents, and lubricators: Nos. 49 and 50, alloys and their manufacture ; No. 51, 

 coke and its manufacture; fluxes; Nos.52to 56, economic collections from Mexico; No. 57,' 



economic collections from Central America: No. 58, economic collections from South A ricai 



Nos. 59 and 60. economic collections from British America; Nos. 61 to 64, coals; Nos. 65 to 67,' 

 hydrocarbon compounds; Nos. 70 to 72. economic collections from Austria; No. 73. economic 

 collections from New Zealand ; Nos. 74 to 76, economic collections from Sweden; No. 77, 

 economic collections from Norway: Nos. 78 and 79. graphite and its applications; Nos. 80 and 

 81, fictile materials; Nos. 82 to 85, asbestos and its applications; Nos. 86 and 87, not perma- 

 nently occupied: Nos. 88 and 89, economic collections from Russia; Nos.90to 93, polishing and 

 abrading materials: Nos. 94 to loo. salts used in chemical manufacture: No. 101, economic 

 collections from Japan; Nos. 102 and 103, economic collections from Germany; Nos. 104 and 

 105, economic collections from Austria; Nos. 106 and 107, economic collections from Portugal; 

 Nos. 108 and 109. economic collections from Spain; No. 110. large mass of anthracite coal; No! 

 Ill, economic collection of kerosene and shale from Australia ; Nos. 112 and 113. Vermont 

 marbles: No. 114, model of the Eureka District. Nevada: No. 115, pedestal; No. 116, table- 

 case and wing-frames with photographs. 



