70 THE ICE A(;E of CANADA. 



ceiio, as illustrated l.y Dr. Ci. :\r. Dawson in bis :\reiiioirs 

 on Jhitisli Cohnnl.ia, by Mr. (.'hahners on the lower St. 

 Lawrence, l.y Tpliam, (Jilbcrt and Speneer in the lake 

 regions, and l.y J)e (leer in Sweden. To Sj.eneer we 

 are indebted for a ^reat mass of valuable observations on 

 the lake margins of the Canadian lakes and the (juestious 

 of the origin of the lakes and the primitive course of the 

 St. Lawrence river anterior to the Tleistocene age, as well 

 as to the h.rmer greater extension of the lakes and the 

 dillerential elevation by which ilicv have been affected.* 



* Canadian Naturalist, 1882. Trans. Ti.S. Canada, 1889. See also 

 ^^'arren Uphani's Appendix to Wright's Ice Age and McCee's Seventh 

 Keport Am. Geol. Survey, p. 039. 



