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Updated: June 11, 2025


As in some grand musical instrument, the strings of which vibrate, the isothermal lines of Europe and Asia beat to and fro, but it takes a year for them to accomplish one pulsation. All over the world physical circumstances control the human race.

They have constructed a radiator closely resembling the theoretically integral radiator which a closed isothermal vessel would be, and with only a very small opening, which allows us to collect from outside the radiations which are in equilibrium with the interior.

The agitation here really seems, as M. Gouy has remarked, to be produced and continued indefinitely, regardless of any difference in temperature; and we seem to witness the incessant motion, in an isothermal medium, of the particles which constitute matter.

It was there where he became one of that Société d'Arceuil, composed of all the great men of the day, to which the paper on "Isothermal Lines" was presented, and by which it was printed, as all papers presented to it were, for private distribution. But from his intimate relations, especially to the court of Prussia, some insinuations have been made as to the character of Humboldt.

Here you enter upon a region presenting to the rarely clouded sky an unbroken foliage-surface, with isothermal zones rigidly marked by their indigenous growths. A tract of country until yesterday bare of surface water for lack of occupation, and lacking occupation for dearth of surface water. Which goes to show that regularity of rainfall is not ensured by copious growth of timber.

Near Madison Square, she paused before the window of a florist's, and raising her veil, gazed longingly at the glowing mass of blossoms, which Nineteenth Century skill and wealth in defiance of isothermal lines, and climatic limitations force into perfection, in, and out of season.

Introducing water into the air cylinder in any other way, except in the form of a spray, has but little effect in cooling the air during compression. On the contrary, it is a most fallacious system, because it introduces all the disadvantages of water injection without its isothermal influence.

Together they press into higher latitudes the annual isothermal lines. If in Europe there are no deserts, there are none of those impenetrable forests seen in tropical countries. From the westerly shores of Portugal, France, and Ireland, the humidity diminishes as we pass to the east, and, indeed, if we advance into Asia, it disappears in the desert of Gobi.

They were above the latitude of 50 degrees; and although in England, which is on that parallel, it is not very cold of a spring night, it must be remembered that the line of equal temperature in the language of meteorologists the "isothermal line," is of a much lower latitude in America than in Europe.

The season here, owing to a sharp northern sweep of the isothermal lines, is two or three weeks earlier than at Quebec. The soil is warm and fertile, and there is a thrifty growing settlement here with valuable agricultural produce, but no market nearer than Quebec, two hundred and fifty miles distant by water, with a hard, tedious land journey besides.

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