Abstract
On the basis of temperature observations made in the Great Lakes in the summer months it has been shown that: (a) the maximum depth of the thermocline does not exceed 50 feet, (b) the temperature gradient within the thermocline may be as much as 26 degrees Fahrenheit in 10 feet, (c) the thickness of the surface layer varies considerably with time and position, and can under certain circumstances be entirely removed from an area, and (d) the temperature of the deeper waters approximates to that of the maximum density of fresh water.

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