Figure 1. — Map of Lake Michigan, showing stations where temperatures were obtained, 1930-32. 

 Station numbers under 100 were occupied in 1930; those between 100 and 200 were 

 occupied in 1931 and those between 200 and 300 in 1932. Stations A, B, C, D, were 

 occupied in 1931; E, F, G, H in 1932, and J, K in 1930. 



