C.or 131 F.), the supply of warm water is so limited that it exercises no appreciable influence on the temperature of that portion of the Lake.

This is further corroborated by the fact that no local fogs hang over this or any other portion of the Lake during the winter which would most certainly be the case if any considerable body of hot water found its way into the Lake.
The true explanation of the phenomenon may, doubtless, be found in the high specific heat of water, the great depth of the Lake, and in the agitation of its waters by the strong winds of winter.

In relation to the influence of depth, it is sufficient to remark that, before the conditions preceding congelation can obtain, the whole mass of water--embracing a stratum of 250 meters in thickness--must be cooled down to 4 deg.

Cent.; for this must occur before the vertical circulation is arrested and the colder water floats on the surface.

In consequence of the great specific heat of water, to cool such a mass of the liquid through an average temperature of 8 deg.