Lake Maxinkuckee, Physical and Biological Survey 153 



recorded by Mr. S. S. Chadwick. Up to April 5, 1900, the tempera- 

 tures were taken at the Chadwick houseboat on the east side of 

 Long Point; after April 5 they were taken on the north end of 

 Long Point in the south side of Outlet Bay, but sometimes at the 

 wagon bridge across the Outlet. From June 25, 1900, to June 30, 

 1901, the temperatures were again taken at the pier in front of 

 the Shady Point cottage, and usually by Mr. Clark. 



Besides these regular observations, a large number of miscel- 

 laneous records were made; a few in November and December, 

 1898, and at various odd times since 1901, by Mr. Chadwick; and a 

 large number by the present writers during the various times when 

 one or both of them have been at the lake since 1901. And many 

 more were taken in various places in the lake during the regular 

 investigations of 1899-1901. 



In addition to the surface temperature observations at the regu- 

 lar station, many other records were made in various parts of the 

 lake, particularly in connection with the seining and other collect- 

 ing operations, and in connection with the serial temperature work. 

 Surface temperatures were also taken as a part of the plankton 

 studies. Since July 1, 1901, surface temperatures have been re- 

 corded at intervals by Mr. Chadwick, also by Dr. Scovell, and by 

 the present writers when any of them happened to be at the lake. 

 The total number of water surface temperature readings taken 

 and recorded exceeds 10,000. Most of these are given in the tables 

 on pages 160 to 215. 



It was felt tnat the large amount of attention given to tempera- 

 ture observations was justified because of the very intimate re- 

 lation which the temperature of the water bears to aquatic animal 

 and plant life. 



It was desired to learn the relation between temperature and 

 the feeding, breeding, and other habits, and the distribution of 

 the different species of fishes, turtles and other animals in the lake, 

 also of the various species of aquatic plants. It is believed that 

 a number of interesting and important correlations have been es- 

 tablished. 



The details of the records may now be considered. 



For the month of January, there are 5 records for 1899, 93 for 

 1900, 93 for 1901, and 12 for 1905. 



As might be expected, there is but slight variation in January 

 in the temperature of the water at the surface of the lake. The 

 temperature of the air is at, below, or near, freezing during most 

 of the days of the month, and, as the water-surface temperature, 



