84 CHICAGO ACADEMY OF SCIENCES. 



North line, Sec. 21, T. 4, R. 23. .......... • 1558 i4-5o 1.08 



West line, Sec. 22, T. 4, R. 23 • • • 19.39 18.43 0.96 



North line, Sec. 27, T. 4, R. 23. . • 26.39 ' 26.39 O-OO 



North line, Sec. 34, T. 4, R. 23 ■ ■ 16.04 i547 0.57 



West line, Sec. 34, T. 4, R. 23 • • 3i-50 30.00 1.50 



North line. Sec. 4, T. 3, R. 23. 28.03 26.50 1.53 



North line. Sec. 9, T. 3, R. 23 18.82 18.00 0.82 



North line. Sec. 16, T. 3, R. 23. . • 27.80 20.60 6.20 



North line, Sec. 21, T. 3, R. 23 • 21.25 18.00 3.25 



North line, Sec. 28, T. 3, R. 23 • . . • ■ 32.22 31.16 1.66 



West line. Sec. 28, T. 3, R. 23 : 30.20 23.87 6.33 



North line. Sec. 32, T. 3, R. 23 34.85 32.40 2.45 



South line. Sec. 32, T. 3, R. 23 . 46.60 44.73 1.87 



Mean of eighteen places, chains . 1.92 



Same in feet, 126.72. 

 Loss per annum in feet, 3.33. 



"The following measurements were made to ascertain the 

 amount of the abrasion of the west shore of Lake Michigan, in 

 Milwaukee County, since the Government Survey, made in 1835 

 and 1836: 



Annual 

 Place. 1835. 1874. Loss. 



Chains. Chains. Feet. 



South line. Sec. i, T. 5, R. 22 45-6i 44-50 1.9 



South line. Sec. 36, T. 6, R. 22. .... 15.90 14.40 2.6 



South line. Sec. 24, T. 6, R. 22 1929 18.70 i.o 



South line, Sec. 21, T. 7, R. 22 8.72 8.42 0.5 



South line, Sec. 15, T. 7, R. 22 5.37 2.82 4.3 



South line. Sec. 10, T. 7, R. 22. 43-35 41-64 2.9 



South line. Sec. 3, T. 7, R. 22 19-34 17-36 3-33 



South line, Sec. 34, T. 8, R. 22. . 22.00 18.69 5-6i 



Mean 2.77 



"The loss in the other counties bordering the lake is less on 

 the average." 



In view of these measurements reported by the Wisconsin 

 Survey, the rate for the entire shore is probably scarcely more 

 than half that of Dr. Andrews' estimates. 



Dr. Andrews calls attention to the existence of a submerged 

 terrace, which, he thinks, furnishes a ready means for determining 

 approximately the original position of the shore, and conse- 

 quently the distance which the bluffs have receded since the water 



