CHAP. XXIV. 



TEMPEEATUKE OF THE WATER. 



G3 



comes mingled with the constantly cold water beneath. 

 The temperature of the surface, therefore, depends less 

 upon the warmth than upon the strength of the winds.* 

 The change which takes place where the surface water 



* On the 9th of Jiily, 1831, at noon, we -were becalmed two or three 

 miles to the southward of Point des Monts, and carried to the SSE. at the 

 rate of 1^ knot by the current. It was nearly high water by the shore, 

 and consequently about an hour and a half before the time when the 

 stream of flood ceases. 



During the night we had a very strong breeze, which, by the morning of 

 the 10th, had reduced the temperatiu-e of the surface water to 37°, and the 

 air to 44°. 



On the 19th of June, 1832, Point de Monts, N. 61° E., distant seven 



miles. Time of tide, half ebb. 

 current, 2 knots to the SSE. 



Wind light from the westward. Rate of 



On this last occasion, the line and attached machine remained perpen- 

 dicular, from which we inferred that the whole body of water moved down 

 the estuary in the ebb tide. At the time of the preceding observations, the 

 line remained perpendicular only as long as the machine was not lowered 

 down beyond three fathoms from the surface. At five fathoms the line 

 di'ew strongly out to the NNW., and still more strongly when the machine 

 was lowered to gi-eater depths. Hence it appeared that, in the flood tide, 

 only a thin superstratum of comparatively light and warm water moves 

 down, and that the colder and heavier water beneath is either stationary or 

 moving up the estuary. — Bayfield's Gulf of St. Lawrence, 



