Among the external circumstances by which the influence of education is modified, the principal are those which come under the head of climate. This circumstance places itself in front, and demands a separate denomination, not merely on account of the magnitude of its influence, but also on account of its being conspicuous to every body, and of its applying indiscriminately to great numbers at a time. This circumstance depends for its essence upon the situation of that part of the earth which is in question, with respect to the course taken by the whole planet in its revolution round the sun: but for its influence it depends upon the condition of the bodies which compose the earth's surface at that part, principally upon the quantities of sensible heat at different periods, and upon the density, and purity, and dryness or moisture of the circumambient air. Of the so often mentioned primary circumstances, there are few of which the production is not influenced by this secondary one; partly by its manifest effects upon the body; partly by its less perceptible effects upon the mind. In hot climates men's health is apt to be more precarious than in cold: their strength and hardiness less: their vigour, firmness, and steadiness of mind less: and thence indirectly their quantity of knowledge: the bent of their inclinations different: most remarkably so in respect of their superior propensity to sexual enjoyments, and in respect of the earliness of the period at which that propensity begins to manifest itself: their sensibilities of all kinds more intense: their habitual occupations savouring more of sloth than of activity: their radical frame of body less strong, probably, and less hardy: their radical frame of mind less vigorous, less firm, less steady.
(Jeremy Bentham, An Introduction to the Principles of Morals and Legislation, ed. J. H. Burns and H. L. A. Hart, in The Collected Works of Jeremy Bentham, ed. F. Rosen and Philip Schofield [Oxford: Clarendon Press, 1996], chap. 6, sec. 39, p. 67 [italics in original] [book first published in 1789])
Keith Burgess-Jackson, J.D., Ph.D. 