62 Lake Maxinkuckee, Physical and Biological Survey 



cell, we have a greater difference of potential between areas of 

 sand than between muck, loam or clay. No marked tendency is 

 shown to congregate in the vicinity of the maximum. 



While the morning readings appear to have a pretty distinct 

 mode, no such feature is apparent in the other two readings, 

 although it cannot be said that a long and diligent scrutiny might 

 not yield some results. For the month of August they are usually 

 close together, but rather indifferent as to position, although in 

 a small majority of cases the evening reading is the lower and 

 when the reverse is true the difference is usually less. On several 

 occasions they were equal. Of 22 observations where the maxi- 

 mum reading was not represented by the morning, however, 15 

 were represented by evening readings and 7 by morning, so there 

 is quite discernible a tendency for these readings to differentiate in 

 this regard. It is worthy of note, too, that of these 22 observa- 

 tions, 7 (4 of the noon and 3 of the evening) represent strong 

 and sudden changes in the barometer at the time, so that the de- 

 parture from the mode may be explained in these cases, quite 

 markedly when all are taken together, as a result of a sort of 

 inertia carrying the barometer beyond its normal reading, and 

 the advantage of the one additional abnormality in favor of the 

 morning reading is, taken altogether, of almost equal value in 

 explaining the abnormality there. 



Am Temperatures 



During the investigations at Lake Maxinkuckee considerable 

 attention was given to air temperatures. 



Beginning with July 5, 1899, the temperature readings were 

 from a Wilder protected thermometer which had been tested by 

 the U. S. Bureau of Standards. This thermometer, from July 5, 

 1899, to May 31, 1901, was hung about 10 feet above the surface 

 of the lake on the shaded side of a cottage near the Arlington 

 station on the west side of the lake. After May 31, 1901, it was 

 hung about 15 feet above the surface of the lake, on the north 

 side of the Chadwick House on Long Point. 



Temperature readings were usually taken three times daily, at 

 6 a. m., noon, and 6 p. m. During the year 1900-1901 a set of 

 standardized maximum and minimum thermometers was installed 

 on the shaded side of the cottage at Arlington and readings from 

 these are given in the appropriate accompanying tables. 



The temperature observations were made and the record kept 

 by various persons, as follows: 



