204 Wisconsin Academy of Sciences, Arts, and Letters. 
It will be noted that the winter temperature for 1891, 1892, 
and 1894 are lower than any others recorded. Since the tem¬ 
peratures of 1892 and 1894 are in January, they are probably 
above the minimum for those years. If we had summer tem¬ 
peratures corresponding to these winter observations the bud¬ 
gets w T ould almost certainly have been unusually high, probably 
over 40,000 cal., and would have raised the average for the lake. 
Nos. 14-25.—There are twelve lakes in the table which be¬ 
long to the region of the Alps north of Italy and east of lake 
Geneva. To these may be added lac d’Annecy and lac du 
Bourget. These lakes furnish thirty-five budgets of which seven¬ 
teen lie below 25,000 cal., fourteen are between 25,000 and 30,000 
cal., and four are exceptionally high. Omitting the four high 
budgets the mean of the remaining thirty-one would be below 
25,000 cal. If all were included it would be somewhat below 
27,000 cal. The Vierwaldstiitter See has been omitted from the 
table on account of its complex form, and there are no annual 
heat budgets recorded for Ammer See or Millstatter See, since 
winter temperatures are lacking. But it is evident that were 
the budgets from these three lakes added to the list the mean 
would not be essentially altered. 
These lakes range in mean depth from 38 m. to 135 m., al¬ 
though only one exceeds 90 m. The area varies more than one 
hundredfold, from 822 ha. to 83,850 ha. The elevation above 
the sea ranges from slightly below 400 m. to 725 m. The lakes 
lie within the Alps in Switzerland, Austria, and France and on 
the north side of the Alps in Germany and Austria. The gen¬ 
eral uniformity and small amount of the annual heat budgets 
in lakes so numerous, so various, and so widely distributed is 
remarkable. Equally noteworthy are the exceptionally high 
budgets which appear in two of the lakes, and the large average 
budgets which appear in Traun-See. 
The conclusion seems warranted that lakes in the region of 
the Alps, and north of Italy, have annual budgets in the region 
of 25,000-27,000 calories, and that lake Geneva with its mean of 
36,500 cal. is far above the average for such lakes, though not 
beyond the amount which other lakes may reach in exceptional 
years. < 
Nos. 14-17.—These Swiss lakes lie to the east of lake Geneva. 
Their-annual heat budgets are all low and are all fairly uniform 
with the exception of Zuger See. This lake shows an excep- 
