Niagara Falls 



1903 



Upham 



1904 



Pohlman 



1905 



Adams 



1905 



Spencer 



1905 



Upham 



1906 



not be regarded as an important basis for predictions of changes 

 of the course of drainage from these Laurentian lakes, turning 

 their outflow away from the Niagara river to the old glacial 

 Chicago outlet 2,000 to 3,000 years hence. 



(In Encyclopedia Americana. 

 Co. N. Y.: 1904. 



1904 



Pohlman, Julius. Niagara Falls. 

 Ed. by F. C. Beach & others. Americana 

 Vol. II.) 



This model encyclopedic article gives a simple account of the geology 

 of Niagara Falls without exploiting prominently the views of the author. 

 There is a discussion of the preglacial drainage and the recession of the 

 Falls. The figures for the depth of the river and Falls are now out of 

 date. For the preglacial period the article adopts the theory of the dis- 

 charge through St. David's channel and three falls beginning at the whirl- 

 pool. The article is elucidated by diagrams, and there is a view of the 

 Falls in winter showing the ice-mound below the American Fall. 



1905 



ADAMS, ALTON D. Recession of Niagara Falls. (Sci. Am., Sept. 

 2. 1905. 93:178.) 



A sketch of the historical and geological arguments and of the effects 

 of the recession. 



Spencer, Joseph William Winthrop. [Report on] Niagara 

 falls and Niagara district. (Can. geol. survey. Summary report. 1905. 

 Pp. 87-91.) 



A review of the previous Niagara surveys and reports of Spencer and 

 others, with an account of the resurvey made by Spencer in 1 905 giving 

 a resume of the recessions of the Falls since his earliest reports, and his 

 soundings in the gorge, with a synopsis of the full report to be issued later. 



Upham, Warren. Geological history of the Great Lakes and 

 Niagara Falls. (Internatl. q., July, 1905. 11:248-265.) 



A history of the glacial lakes, Niagara Falls as a chronometer, the 

 future of Niagara and the Upper Lakes, and the dangers of diversion. 



1906 



Recession of Niagara Falls. (Sci. 

 62:25651-25652.) 



656 



Am. sup., Sept. 8, 1906. 



