Lake Maxinkuckee, Physical and Biological Survey 211 



The Kettlehole: Similar observations were made at the Kettle- 

 hole in July, August, and September, 1899, and again in the same 

 months in 1900. The records are shown in the tables on the fol- 

 lowing pages. The highest surface temperatures recorded at the 

 Kettlehole was 83.2 on August 7 and 22, 1900, the lowest tempera- 

 tur 48.5 at 40 feet on September 8, 1899. The maximum differ- 

 ence between surface and bottom was 31.9. 



SERIAL TEMPERATURES TAKEN AT THE KETTLEHOLE, LAKE MAXINKUCKEE 



1 At 32.5 feet. 



