582 THE FKESH- WATER LOCHS OF SCOTLAND 
Finland; to-day it is 16 feet above sea-level. Schokalsky i made 
temperature observations in the summers of 1897 and 1899, and 
reported that in 1897 the vertical distribution of temperature was 
Bartholomew 
Fig. 70. — River Neva drainage basin. 
direct throughout, though a great difference was observable between 
the figures obtained in the north and south portions of the lake, the 
water of the northern deeper part being colder both at the surface 
and at fixed depths than in the southern part. The warmest surface 
1 See " Le Lac de Ladoga au point de vue tliermique," VII. Internat. Geogr. 
Kongr., p. 263, Berlin, 1899. 
