Birge—Heat Budgets of American and European Lakes. 199 
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 
1895 III 7 
1908 II25 
1907 II 12 
2.66 
4.04 
4.27 
1848 VIII 30 
1868 X 10 
1869 X 1 
1870 X 26 
1873 X 5 
1874 IX 25 
1878 X 7 
7.28 
8.25 
*8.10 
*7.00 
*7.54 
‘7.72 
*7.49 
95-95 
06-06 
06-07 
07-07 
5.50 
3.26 
3.03 
3.03 
49,500 
29.300 
27.300 
27,300 
48 
68 
69 
70 
73 
74 
78 
91 
95 
06 
07 
29,100 
38,000 
36.900 
27,000 
31.900 
33,500 
31.400 
28,200 
37.400 
29,700 
29,700 
24 
1991 VIII 29 
1895 IX 6 
1906 VIII 22 
1907 VII19 
7.13 
8.16 
*7.30 
*7.30 
Mean 
33,400 
Mean 
32,100 
1897 II 7 
1.52 
1895 VIIT 19 
1896 VIII 5 
11.83 
10.89 
96-97 
9.37 
27,200 
1 95 
| 66 
22,700 
20,000 
25 
1906 II ? 
3.2 
1905 VIII 1 
9.1 
05-06 
5.90 
25,400 
05 
21,900 
26 
1887 
1904 
5.10 
5.10 
1887 IX 8 
1903 VIII17 
1904 IX15 
*7.65 
*8.00 
*8.05 
87 -87 
03-04 
04-04 
2.55 
2.90 
2.95 
33,900 
38,600 
39,200 
27 
Mean 
37,200 
1887 
1903 III 26 
5.50 
5.45 
1887 IX 3 
1902 VII 3 
1903 X 23 
*8.74 
*8.70 
*9.10 
87-87 
02—03 
03-03 
3.24 
3.25 
3.65 
28,200 
28,300 
31,800 
28 
Mean 
2M00 
1887 
5.30 
1887 IX 7 
*9.80 
87-87 
4.50 
31,500 
29 
1900 III 10 
4.44 
1900 IX 6 
*8.67 
00-00 
4.23 
25,800 
30 
1899 III 23 
1900 III 24 
1903 II 15 
1906 II26 
1907 II 24 
2.20 
0.33 
0.90 
1.47 
0.81 
1899 VII 26 
1900 IX 2 
1903 VITl 11 
1906 X 7 
7.71 
8.09 
9.80 
9.41 
99—99 
00-00 
03-03 
06-06 
06-07 
5.51 
7.76 
8.70 
7.94 
8.60 
21.500 
30,300 
33,900 
31.000 
33.500 
199 
100 
03 
06 
14,500 
15,700 
18,300 
16,400 
31 
Mean 
32,000 
16,200 
1899 I 7 
1900 III11 
0901 III 9 
1901 IV 17 
*3.25 
*3.25 
*3.27) 
*3.17 
1899 IX 14 
1900 IX10 
1901 VIII 7 
*5.18 
*5.24 
*6.41 
99-99 
99-00 
00-00 
00-01 
01-01 
1.93 
1.93 
1.99 
2.07 
3.24 
38.100 
36.100 
37,300 
38,700 
60,600 
99 
00 
01 
22,100 
23,300 
45,100 
32 
Mean 
+41,800 
37,000 
+30,200 
22,700 
1900 IV 25 
1.26 
1900 X 17 
7.20 
00-00 
5.94 
33,300 
00 
18,000 
33 
+ Including 01—01, 
