180 REPORT OF NATIONAL MUSEUM, 1893. 



DEPARTMENT OF OEOLOGY, 



A very large portion of the year was devoted by Prof. George P. 

 Merrill, the curator, and his assistants, to the preparation of an exhibit 

 for the Columbian Exposition, a general outline of which was given in 

 the curator's report for 1892. Lack of space necessitated a certain 

 amount of curtailment in the original plans, but as carried out the 

 exhibits were classified and arranged as below : 



I. VULCAXOT.OGY. 



(a) A mapof tlie world showing in red the distribution of active and 

 recently extinct volcanoes, compiled mainly from ]\[eumayer\s Erdges- 

 chichte. 



{b) A geological map of the United States sbowing in red the areal 

 distribution of recent volcanic rocks in the United States, comi)iled by 

 Prof. C. H. Hitchcock, in 18SG, and published in the Transactions of 

 the American Institute of Mining Engineers. 



(c) A model of the Ice Spring Craters, a group of recently extinct 

 volcanoes near Fillmore, ITtah, modeled from surveys made under the 

 direction of the U. S. Geological Survey; scale, 100 feet to 1 inch, hori- 

 zontal and vertical the same; size of model, 5 feet square. 



[d) A large series of photographs showing cbaracteristic volcanic 

 phenomena, as below: 



(1) Two eidarged views of the volcano on Bogoslof Island, Bering 

 Sea. 



(2) A series of views of Bogoslof and mounts Shishaldin and Maku- 

 shin, in Alaska. 



(3) A series of views of Hawaiian volcanoes and lava flows. 



(1) A series of views of Vesuvius, Italy, and the volcanoes of the 

 adjacent islands, including Stromboli, Etna, and Yulcano, in various 

 stages of volcanic activity. 



* (5) Views of a recent volcanic cone and lava fields near Snag T^ake, 

 California. 



(G) Three views of the grand volcanic neck known as Mato Teepee, 

 Bear Lodge, or the Devil's Tower, in Wyoming. 



(7) Views of columnar volcanic rocks in the Yellowstone National 

 Park, in the vicinity of Orange, X. J., and at Bonn, Prussia. 



(8) Views of geysers and hot s]nings in the Yellowstone National 

 Park. 



{e) A series of specimens of volcanic products in characteristic forms, 

 as lavas, fragmental ejectamenta, and sublimation products, as fol- 

 lows : * 



(1) Columnar basalt, from Bonn, Prussia, and the Giant's Cause- 

 way. 



* These collections were accompanied, whenever possible, by ])hotograplis of the 

 immediate reijions from which thev were collected. 



