VI Contents. 
county, Idaho, /. C. Russell, 319; Geological Survey of Can- 
ada, Annual Report, New Series, Vol. XI, George M. Dawson. 
321 ; Contributions to Mineralogy and Petrography, Sheffield, 
Scientific School, Penfleld and Pirsson, 322; Dragons of the 
Air, H. G. Seeley, 323 ; Preliminary report on the Copper- 
bearing rocks of Douglas county, Wisconsin, containing a pre- 
liminary report on the copper-bearing rocks of parts of Wash- 
burn and Bayfield counties, U. S. Grant, 323 ; An investigation 
of tlic buried valley of Wyoming, JVilliain Griffith, 324. 
Monthly Authors' Catalogue of American Geological Litera- 
ture 325 
Correspondence : 
Heavy rains and possible volcanic action in Nicaragua, /. 
Crawford, 328; Second Edition of the Geological map of 
West Virginia, /. C. White, 328; New York Academy of Sci- 
ences, Richard E. Dodge, 329. 
Personal and Scientific News. 
Movements in the Rocky mountains, 332 ; Field Columbian 
Museum, 333 ; Another Kansas meteorite, 334 ; Difficulties of 
deep coal mining, 334. 
DECEMBER NUMBER. 
Ralph Dupuy Lacoe. [Portrait.] H. E. Hay den 335 
The Loess of Iowa City and Vicinity. B. Shimek 344 
Prof. W. H. Barris . [Portrait.] C. H. Preston 358 
A Section of the Upper Ordovician at Vevay, Indiana. [Plates 
XXXIV and XXXV.] E. R. Cumings 361 
The Cleveland Water-supply Tunnel. 6'. /. Pierce 380 
Editorial Comment. 
Fundamental changes in the Archean and Algonkian as un- 
derstood by Prof. Van Hise of the United States Geological 
Survey 385 
Review of Recent Geological Literature. 
A Treatise on Zoology, E. Ray Lankester, 388 ; Recent discov- 
ered extinct vertebrates from Egypt, Chas. W. Andrew 389; 
Ueber die Entwickelung der silurischen Sedimente in Bohem 
und in sudwesten Europas, Fritz Freeh, 390. 
Monthly Author's Catalogue of American Geological Litera- 
TUEE 
