84 Canadian Record of Science. 



Air in sun * 80° F. 



Surface water 69°. 



5 feet 68.75°. 



12 " 67.75°. 



18 " 67-66°. 



30 " 67.75°. 



72 " (bottom) 67°. 



Again, in a very shallow stream on Wolfe Island, lightly- 

 flowing over exposed limestone rocks, the air on June 14th, 

 at 3. 15 p.m., at three feet above the water, indicated 73° F., 

 whilst the water at 1.5 inches registered 83° F., at 4 inches 

 varied between 79.5° and 82 5° F., and at 7 inches, on the 

 bottom, fell to 72.5° F. 



Junction op Affluent Streams. 



An illustration of the effects of the warmer waters of the 

 affluent streams on the main body of the St. Lawrence 

 waters, was the case of the Gananoque River at its outlet. 

 The temperature of the bottom near the foot of the fall 

 was, on 10th June, 62. 75° F. ; a quarter of a mile down 

 stream, at the outlet to the St. Lawrence, it was 61.5° F. ; 

 in the St. Lawrence, 150 yards off the outlet, 57 Q F. ; 100 

 yards west of this, against the current of the St. Lawrence, 

 56.75° F., and 100 yards still further west 54.25° F. The sur- 

 face water at these different points varied only between 

 62.25° and 63° F. The Gananoque River current below the 

 falls is strong, and by a westward deflection of the sandstone 

 banks at the outlet, it is thrown against the much lighter 

 St. Lawrence current, but as above shown, the effect is 

 soon gradually lost at the bottom of the St. Lawrence, how- 

 ever much farther it might be traced at the surface. 



Gradual Absorption of Heat. 



The general rise in the temperature of Lake Ontario 

 waters as the summer advances is, at first, slow, compared 

 with the general rise in the temperature of the air, but, as 

 midsummer is reached, the rise is more rapid both at the 



