Abstract
1. To find the numerical law according to which the temperature of a place varies with its latitude, is an empirical problem which has, since the middle of the last century, from time to time engaged attention.2. Lambert, Mayer, and Kirwan in the last century, De Humboldt, Brewster, Kämtz, and Dove in the present, may be cited amongst those who have investigated formulæ which express, with more or less accuracy, the mean temperature of a place in terms of its latitude.3. The formulæ proposed are mostly reducible to two types—a variation depending upon the cosine of the latitude simply (that of Sir D. Brewster), and one depending on the square of the same quantity (that of Mayer).

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