J.D.Diina — Soi/t/tininl Disrjui /v/' of fj /'/.y Winnipeg. 429 



era; Nut he sets this idea aside, and argues for an ae; 

 of land-level, and makes the southward discharge to have ended 

 inconsequence of a depression of land to the south, accompa- 

 nying (as added in his paper of 1875) a rise to the north ; and 

 iTistancinnr, as examples of a corresponding chaime of level, the 

 former south war < I discharge of Michigan Lake through the Illi- 

 ;;i- River, and of Winnebago Lake through the ' Wisconsin 

 River. A map of the iarue Winnipeg Lake— larger he observes 

 tban Lake Superior and Michigan 'together, and having the 

 .'an River as the head stream— accompanied the 

 written report sent to the Department, but it was not published, 

 foe same view is presented at more length in the paper of 

 1874 (Report for 1875), along with a wider discussion of the 

 facts, and a review of the writings of previous travelers who 

 had recognized the lake-like features of the region. 



''I""" >dea of the southward discharge of Lake Winnipeg was 

 "-'ntedauain in 1*75 h\ Mr. (Jennie M. Dawson, in his ex- 

 cellent Report on the Geolo-v of the re-ion in the vicinity of 

 [he 19th Parallel, with a recognition of General Warren's paper, 

 "it with the statement that the inference was an independent 

 one. In explanation, he say- (pp. 2oo. 254) that "by the flow 



*' hasinsof the Winnipeg o T oup"< flakes md tin -real v»lle\ 

 of the Red River itseli can do .explained : the river cutting 

 l!n ^nwardand westward on the sloping surface of the Lauren- 

 :::i11 roeks. at the expense of the Cretaceous strata, and later of 



nea of the Devonian and Silurian; the blocking up 

 °f the southern exit ami chummd direction of flow being a phe- 

 nomenon onlv similar to that which is known to have taken 



the Great Lakes of the St. Lawrence." 



Ihe ice-hairier hvpothesis ha- been sustaiuetl. in place of 



\f "f a change of level, bv Professor N. H. Winchell in his 



,! " -'fa Report for 1*77, who there observes, in his explana- 



i;ike. having first appeared at the south or Minne- 



-•o-w toward the north as fast as the retreating ice- 

 sheet made wav for it." In the Minnesota Report for 1879, 

 .■'■ _■•'■-■ view" is urged, with more detail, by Mr. Warren 



^ decision between these two conflicting explanations is of 



ae to a n_ hi, h M., , [,,,_ ol <i imu events 



^ I there ts, taking 



> papers and the Eeport of 

 Alr - Dawson. 



*• The Red River of the North, rising in Lake Traverse, 

 a°ws northward along the west side of Minnesota for 225 miles, 

 rosses then the 49th parallel, and continues on the same course 



