Birgc—Heat Budgets of American and European Lakes. 195 
AND EUROPEAN LAKES—Continued. 
Winter Tempera¬ 
ture, Tm w - 
Summer Tempera¬ 
ture, Tm s - 
Tm s - 
- Tm w - 
Annual 
Heat 
Budget 
Dm (Tm s 
—Tm w ) 
Calories. 
Wind-distributed 
Heat. 
Dm (Tm s -4.) 
No 
Date. 
Value. 
Date. 
Value. 
Year. 
Value. 
Year 
Calories. 
1890 
1894 
1895 
II 28 
1114 
1127 
*3.37 
*4.85 
*3.02 
1890 VII 2S 
1891 VII1C 
1893 VIII IS 
*9.86 
*9.35 
*10.66 
90-90 
93-94 
6.49 
5.81 
26,600 
23,800 
90 
91 
93 
Mean 
24,000 
21,900 
27,300 
11 
24,400 
1895 
1112 
6.00 
1394 VIII 12 
8.26 
94—95 
2.26 
41,800 
12 
95-95 
2.04 
37,700 
1899 
II 8 
7.15 
1895 VIII 2] 
8.04 
98—99 
0.92 
17,000 
1900 
III 25 
6.96 
1898 VIII 2 
8.07 
99-99 
1.66 
30,700 
1901 
III 7 
6.86 
1899 IX 26 
8.81 
99-00 
1.80 
34,2G0 
1903 
II 26 
6.91 
1900 IX10 
8.64 
00-00 
1.64 
31,000 
1904 
1125 
7.00 
1902 X 3( 
8.68 
00-01 
1.78 
32,900 
1903 VIII 24 
8.50 
02-03 
1.77 
32,700 
1904 VIII 27 
8.96 
03-03 
1.59 
29,400 
03-04 
1.50 
27,800 
04-04 
1.96 
36,300 
Mean 
32,000 
1879 VIII 20 
7.80 
13 
1880 
II 26 
4.84 
1880 IX 8 
7.21 
79-80 
2.96 
45,600 
1883 
1126 
5.92 
1884 IX 23 
8.00 
80-90 
2.37 
36,500 
1885 VIII 18 
7.94 
1884 
III 15 
6.01 
( 1889 IX 19 
6.57 
84-84 
1.99 
30,600 
1891 
II 21 
4.07 
1900 VIII 16 
7.27 
1892 
I 16 
4.65 
1906 IX14 
8.06 
00-00 
1.43 
22,000 
1894 
I 24 
4.33 
06—06 
2.61 
40,200 
1900 
IV 12 
5.84 
06-07 
2.84 
43,700 
1906 
IV 2 
5.45 
Mean 
2.37 
36,600 
1907 
III 22 
5.23 
1848 
III 28 
4.65 
1848 IX 6 
6.48 
48-48 
1.83 
24,700 
14 
1849 
II 3 
4.72 
1880 VIII 5 
6.57 
48-49 
1.76 
23,800 
1097 
I 8 
4.50 
1906 VIII 21 
7.50 
06-07 
2.90 
24,400 
08 
38,900 
1& 
1908 
TI22 
4.00 
1907 IX 2 
6.67 
07-07 
2.17 
18,200 
1909 
III 6 
3.41 
1908 VIII10 
8.63 
08-08 
4.63 
38,900 
08-09 
5.22 
43,800 
Mean 
31,300 
1897 
T 5 
1897 VII 20 
9.33 
97-97 
5.38 
23,700 
97 
23,500 
16; 
1906 
IT 25 
3.88 
1906 VII 1 
8.53 
06-06 
4.65 
20,500 
06 
19,900 
1907 
III 16 
3.34 
1907 VII13 
7.93 
06-07 
5.19 
22,800 
07 
17,300 
07-07 
4.59 
20,200 
Mean 
21,800 
20,200 
1870 IX 1 
7.12 
70 
28.100 
17 
1880 VIII ? 
6.73 
80 
24.600 
1890 
II 28 
3.49 
1889 VIII 28 
5 81 
89-90 
2.32 
20,960 
89 
16.300 
1891 
11 7 
3.57 
1890 ? ? 
6.20 
90-90 
2 71 
24,400 
90 
19,800 
1907 
II 28 
3.91 
1907 X 10 
6.58 
90-91 
2.63 
23,700 
07 
23,200 
07-07 
2.67 
24,000 
1 
1 
Mean 
237200 
22,400 
