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At that distant epoch the sub-arctic breezes must have been blowing pretty stiffly in our present temperate latitudes, and these forms would have been constrained, in due time, to seek a more congenial isotherm. They must accordingly have set out on their expedition, at about the period indicated, with the prospect of a long and tedious journey before them.
"Well, listen, Shandon; it evidently follows from geographical facts, and from the study of isotherm lines, that the coldest point of the globe is not at the Pole itself; like the magnetic point, it deviates several degrees from the Pole.
Tolima looms up in the distance, and we soon ascertain that its height is sufficient for all scientific purposes. Its summit displays a glittering ice-cap, and we are certain to find the proper isotherm by climbing its umbrageous sides.
When we remember that in New England and on all its isotherm it is winter all that half of the year when most of us are at home, why should we not seek to realize this snow-garden dream? Even a partial or faulty achievement of it will surely look lovelier than the naked house left out on its naked white lawn like an unclaimed trunk on a way-station platform.
He drew his isothermal lines not where some occult calculation would locate them on an ideal globe, but where practical tests with the thermometer locate them on our globe as it is. London, for example, lies in the same latitude as the southern extremity of Hudson Bay; but the isotherm of London, as Humboldt outlines it, passes through Cincinnati.
This fact furnishes the explanation of the ease with which the French explorers penetrated the valley from the north. A high mountain range kept the English colonists out of it from the east. The isotherm which touches the southern limits of France passes midway between the source and mouth of the river.
E. M. King, Contemporary Review, Dec., 1873, in an article on "Coöperative Housekeeping." Principles of Political Economy, Mill. American Ed., D. Appleton & Co., Vol. I., p. 551. Body and Mind, 2d Ed., p. 300. Referring to New York, Boston, or places on same isotherm.
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