148 Dr. V. Harley. The Influence of Intra- Venous [June 7, 



4 ft. per mile ; and at the outlet of Lake Ontario, 5 ft. per mile ; all in a 

 north-eastward direction. Taking the amount of movement in each 

 district as representing also the proportional measure of time, then 

 calculations can be made upon several of the beaches, and in terms of 

 the age of Niagara their antiquity can be inferred. The importance 

 of the computations in this paper is that they support the correctness 

 of the calculated age of the Falls. In the application of these results 

 it appears that the rate of terrestrial uplift in the Niagara district is 

 about 1'25 ft. a century ; 2 ft. east of Lake Huron, and 2*5 ft. at the 

 outlet of Lake Ontario. Here was found the first long looked-for 

 indication of the rate of uplift. 



13. The Relation of Niagara Falls to Geological Time. From the 

 study of the deserted beaches, it appears that the commencement of 

 the lake epoch was as long before the birth of Niagara Falls as the 

 Falls are old, so that the beginning of the lake age was probably 

 64,000 years ago, or perhaps even 80,000 years. Against this con- 

 jecture we have as yet no proof. On the other hand, some suppose 

 the lakes to have been held in by glacial dams, continuing for long 

 episodes at the same level, and by the withdrawal of the glaciers 

 the waters were lowered in addition to the terrestrial deformation. 

 With this assumption, the retreating ice continued until the end of 

 the Iroquois episode, or from our computations until 14,000 years 

 ago. But here we need much more investigation. The present paper 

 is merely a contribution in a field of work in America, in which only 

 a few workers have so far contributed the detailed labours upon which 

 this study is built. 



14. The End of the Falls. From the rate of terrestrial elevation 

 and the rate of recession of the Falls, it appears that if the move- 

 ments continue as they have been progressing, then before the Falls 

 shall have retreated to Lake Erie, the Niagara outlet will have been 

 deserted, and the waters of the upper lakes will discharge by way of 

 Chicago into the Mississippi drainage, a change analogous to the 

 turning of the Huron waters into the Erie valley from the Ottawa 

 outlet. This change might be expected 7,000 8,000 years hence. 



IV. " The Influence of Intra- Venous Injection of Sugar on the 

 Gases of the Blood." By VAUGHAN HARLEY, M.D., Teacher 

 of Chemical Pathology, University College, London, Grocer 

 Research Scholar. Communicated by GEORGE HARLEY, 

 M.D., F.R.S. Received May 9, 1894. 



In a paper on "The Effects and Chemical Changes of Sugar 

 injected into a Vein "* I showed that when grape sugar is injected- 

 * ' Koy. Soc. PPOC.,' 1893. 



