550 
BULLETIN OE THE BUREAU OP FISHERIES. 
Surface and epilimnion . — The table shows that the surface temperatures of these lakes 
varied about as would be expected considering their size and depth. During the time 
necessary to visit the lakes no considerable depression of temperature occurred which 
would cool the surface, so that the observations in the different lakes are comparable. 
Fig. 6. — Temperature curves of the six major Finger Lakes in 1911, shown to the depth of 50 meters. One vertical space represents 
5 meters in depth; one horizontal space represents 2“ C. See p. 548. 
During 1910 the weather was without a cold period until after the first week in September, 
and in 1911 the first weeks of September were among the warmest of the season, and no 
marked depression of temperature occurred during August. There is therefore every 
reason to believe that the series represents the approximate maximum of the season, 
a maximum which would be surpassed during a succession of calm, hot days, but which 
