56 CHICAGO ACADEMV OF SCIENCES. 



Chamberlin. — Prof. T. C. Chamberlin has presented a brief 

 discussion of the beaches along the Wisconsin shore of Lake Mich- 

 igan in the Geology of Wisconsin (i), which includes many im- 

 portant data concerning the shore phenomena and an interpreta- 

 tion of the lake history. In the twenty years which have elapsed 

 since this report was published, the studies of the shores of the 

 Great Lakes have brought out a more complex history than had 

 been anticipated, hence the interpretation does not fully meet the 

 case, though it recognizes important fluctuations' of lake level. 



Leverett. — Although there have beea frequent references to 

 the southwestward outlet and the ancient beaches, in geological 

 literature, within the past 20 years, no publication especially de- 

 voted to them appeared until 1888, when a paper was published by 

 the present writer in the Transactions of the Wisconsin Academy 

 of Sciences, entitled "Raised Beaches at the Head of Lake Michi- 

 gan" (2). This paper gives a somewhat detailed account of each of 

 the several beaches found south of latitude 42 degrees 30 minutes, 

 the latitude of the line of Wisconsin and Illinois. It contains but a 

 brief reference to the outlet. 



Cooley . — Prof. L. E. Cooley, consulting engineer of the 

 Chicago Drainage Commission, has published two papers which 

 deal to some extent v/ith the Chicago outlet (3). The first paper 

 discusses the outlet as a means for improving the sanitary condi- 

 tions at Chicago. The second paper deals with it as an important 

 line for navigation and discusses the proper means for obtaining 

 the best results. This paper contains a large amount of valuable 

 data concerning the regimen of the Illinois and Des Plaines Rivers. 

 Marshall — The Report of the U. S. Army Engineers for 1890 

 contains much material collected by Capt. W. L. Marshall con- 

 cerning the Chicago outlet as a channel for navigation ; also refer- 

 ences to earlier work by that organization. 



Taylor- — Mr. F. B. Taylor has published, in the American Geol- 

 ogist, observations on high beaches in the northern portion of 

 the basin of Lake Michigan. These beaches he thinks pass be- 

 neath the present lake level before reaching the southern end of 

 the basin (4). This being the case they have no connection with 

 the outlet under discussion. 



[1] Geology of Wisconsin. Vol. 2, 1877, pp. 219-233. 



[2] Trans. Wis. Acad, of Sciences. Vol. VII, 1883-87, pp. 177-192. Published in 1S8S 

 rsi Water Supplies of Illinois in relation to Health, Eeport of State Board of 

 Health, I880. 



Lake and Gulf Waterway. Private publication, 1890. 



[i] American Geologist. Vol. XIII, May, 1894. 



