Figure 6. --Movements of bottles released off Ludington, June 23, and along the tran- 

 sect, Manistee to Two Rivers, June 24, 1931. 



northward none had entered Traverse Bay or 

 reached the Straits of Mackinaw. Nine (36 

 percent) of the bottles retained their drags. 



Sheboygan to Sheboygan Reef to 

 Racine 



Forty-two bottles (table 7) were released 

 June 26 and 27, 1931, in Wisconsin from 

 Sheboygan to Sheboygan Reef to Racine (fig. 7). 

 Of the 29 (69 percent) bottles recovered 11 

 moved northeast, 7 southeast, 3 east, 7 south- 

 west, and 1 northwest. Twenty-one bottles 

 that crossed the lake floated 37-124 minimum 



miles, an average of 60.7, and were scattered 

 along the Michigan shore from 7 miles north 

 of Holland to 3 miles southwest of Good Harbor. 

 It is unusual that 18 of these bottles had 

 moved to the same extended area across the 

 lake. The other eight bottles ranged from 

 Lake Forest, Illinois, to 9 miles north of 

 Sheboygan, Wisconsin, and had floated from 

 2-55 miles, an average of 24.4. All but three 

 of the bottles in Michigan were found in 32 

 days and all but one on the west coast in 61 

 days. Only six (23 percent) of 26 bottles kept 

 the drag. 



15 



