ADDITIONS TO THE LIBKAUT. 193 



Dana, J. D. Sedgwick and Murchison ; Cambrian and Silurian. 

 8vo. New Haven, 1890. 



Danube, European Commission of the. Memoire sur les travaux 

 d'amelioration du cours du Bas-Danube executes pendant la 

 periode 1873-1886 par la Commission Europeenne instituee en 

 vertu de Tarticle 16 du traite de Paris du 30 Mars 1856. Text. 

 4to. Galatz, 1888. Atlas. Eol. Leipzig, 1887. Presented 

 through the Foreign Office hy direction of the Marquis of Salishury. 



Darton, N. H. On the occurreuce of Basalfc Dikes in the Upper 

 Paleozoic series in Central Appalachian Yirginia ; with notes on 

 the Petrography by J. S. Diller. 8vo. Kew Haven, Conn., 

 1890. 



Dautzenberg. See BoUfus, G. 



David, T. W. E. See New South Wales. Australian Museum. 



Davis, W. M. The Physical Features of New England. 4to. 

 Cambridge, Mass. 1888. Presented hy W, WhitaJcer, Esq., 

 F.E.S., qc. 



. Geographic Methods in Geologiclnvestigation. 8vo. Wash- 



ington, 1888. 



. The Eivers and Yalleys of Pennsylvania. 8vo. Washing- 

 ton, 1889. 



Davis, W. M. The structure of the Triassic Formation of the Con- 

 necticut Yalley. 8vo. Washington, 1889. 



-. Topographic Development of the Triassic Formation of the 



Connecticut Valley. 8vo. New Haven, 

 — . Structure and origin of Glacial Saud Plains. 8vo. Wash- 



ington, 1890. 



and J. W. Wood, Jr. The geographic development of Northern 



New Jersey. 8vo. Boston, 1889. 



Dawson, G. M. Glaciation of High Points in the Southern Interior 

 of British Columbia. 8vo. London, 1889. 



. On the Earlier Cretaceous Eocks of the North-western 



portion of the Dominion of Canada. 8vo. New Haven, 1889. 

 — . On some of the larger unexplored regions of Canada. 8vo 



Ottawa, 1890. 



and F. D. Adams. Notes on the Ore-Deposit of the Treadwell 



Mine, Alaska, by G. M. Daiuson ; On the Microscopical Character 

 of the Ore of the Treadwell Mine, Alaska, by F. D. Adams. 8vo. 

 Minneapolis, 1889. 



