182 |Wisconsin Academy of Sciences, Arts, and Letters. 
American budgets; while 80% of the American budgets are in 
the upper region that contains only 40% of the European. It 
must be noted further that eleven budgets, or more than half 
of those found in Europe which exceed 25,000 cal., are from one 
lake—Traun-See, which is obviously exceptional in this partic¬ 
ular. Some of the other exceptionally high budgets are dis¬ 
cussed in the notes to Table A. 
The uniformity of the American budgets is as noteworthy as 
their size. 80% of them lie between 25,000 and 30,000 cal. I do 
not suppose that a larger collection would show the same uni¬ 
formity, but I believe that, on the whole, the American lakes will 
be closer to each other than are the European. 
ForeFs theory (’01) that the heat budget of northern lakes is 
greater than that of lakes farther south cannot be proved or 
disproved by the records of the European lakes, or by these with 
the addition of the American lakes. The budgets that exceed 
40,000 cal. are as follows: 
Como 
41,800 cal. 
Geneva 
45,600, 40,200, 43,700 cal. 
Zug 
43,800 cal. 
Traun 
49,500 cal. 
Mjosen 
60,600 cal. 
According to Halbfass’ figures, loch Ness would have a bud¬ 
get of 43,000 cal. Of the American lakes, Skaneateles has one 
budget of 41,900 cal. and reason is given in our paper for be¬ 
lieving that in this lake budgets as great as 45,000 cal. may be 
found. The same is doubtless true of other deep lakes of the 
Finger lake series. It seems certain that the budget of Mjosen 
is larger than the facts warrant. At any rate, these budgets 
show no decided preference for northern lakes and do not confirm 
Forel’s theory. On the other hand, the. average budgets of loch 
Ness and Mjosen (omitting the exceptional one) are somewhat, 
though but little, greater than those of Geneva, and possibly 
the average of many years is as great as 40,000 cal. Very prob¬ 
ably a longer series would confirm this relation of superiority on 
the part of the northern lakes. But there is no good reason to 
attribute this difference to the northern latitude. There is more 
