Science, Geology and Physics 



Niagara was vastly augmented, owing to the addition of the waters from 1908 

 the three highest lakes, which now took place." Spencer 



Upham, Warren. Niagara as a measure of post-glacial time. (Rec. 1908 

 past, Sept. 1 908. 7:244-246.) u P^m 



An excellent summary of Spencer's work. Mr. Upham believes that 

 " the great continental ice sheets melted away between 10,000 and 5,000 

 years ago," while Spencer computes the period at 39,000 years. 



WILLIS, BAILEY. Changes in the recession of the Falls of Niagara. 1908 

 (Science n. s., Sept. 18, 1908. 28:381-384.) Willi. 



Account by Bailey Willis of the July 1—3, 1908, meeting of the 

 American Association for the Advancement of Science. This account 

 includes a resume of Spencer's paper on " Changes in the Recession of the 

 Falls of Niagara." 



Wright, George Frederick. Chronology of the glacial epoch in 1908 

 North America. (Geol. Soc. of London. Quarterly jour. 1 908. Wright 

 64:149-151.) [Abstract.] 



The author estimates the age of the Niagara gorge to be less than 

 1 0, 1 00 years. 



1909 



FAIRCHILD, HERMAN LEROY. Glacial waters in central New York. 1909 

 (N. Y. state museum. Albany: 1909. Bull. 127.) Fairchild 



On pages 30-31 of this bulletin may be found an account of the " Birth 

 of Niagara Falls and Lake Erie." 



Spencer, Joseph William Winthrop. Interruption in the flow 1909 

 of the Falls of Niagara in February, 1 909. (Geol. Soc. of Am. bull. Spencer 

 Aug. 10, 1910. 21:447-448.) 



Read before the society December 29, 1 909. Gives the causes of 

 the interruption of the flow with an account of previous similar occurrences. 



Spencer, Joseph William Winthrop. Relative work of the two 

 Falls of Niagara. (Geol. Soc. of Am. bull. Aug. 10,1910. 2 1 :44 1 - 

 446.) 



This paper, read before the society December 29, 1909, deals with 

 the " Rate of Recession of the American Fall and the Relative Efficiency 

 of the Two Falls." 



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