isochimenal

Suppose, then, that some seven hundred thousand years ago, more or less, when the North Pole had fully donned the earth's ice-cap, with all the isothermal and isochimenal changes thereby effected, what must have been the line of march taken by our northern vegetal and animal forms to escape the cataclysm of ice and snow then impending?

Life: Its True Genesis R. W. Wright

But if this terrible catastrophy had been avoided, and some of our extreme northern forms had forced their way through the Isthmus into the lowlands of Columbia, they must have done so at their greatest possible peril, even if they had reached the base of Old Mt. Tolima in advance of the thermal equator, now fleeing in dismay before the southern Ice-monarch, with all his isochimenal hosts in mad pursuit of their invaders.

Life: Its True Genesis R. W. Wright

Again he speaks of the isochimenal line (a line of even winter temperature), which he says reaches from Fort Laramie to the headwaters of the Yellowstone, at the hot spring and geysers of that stream, and continues thence to the Beaver Head valley, and he adds:

The Discovery of Yellowstone Park Nathaniel Pitt Langford 1871

If the surface of the Earth consisted of one and the same homogeneous fluid mass, or of strata of rock having the same color, density, smoothness, and power of absorbing heat from the solar rays, and of radiating it in a similar manner through the atmosphere, the isothermal, isotheral, and isochimenal lines would all be parallel to the equator.

COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814

The nature of these inflections, the angles at which the isothermal, isotheral, or isochimenal lines intersect the parallels of latitude, their convexity or concavity with respect to the pole of the same hemisphere, are dependent on causes which more or less modify the temperature under different degrees of longitude.

COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814

The system of 'isothermal, osotheral' and 'isochimenal' lines, which I first brought into use in 1817, may, perhaps, if it be gradually perfected by the united efforts of investigators, serve as one of the main foundations of 'comparative climatology'.

COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814

The curves of the isothermal lines, and more especially those of the isochimenal lines, correspond with the limits which are seldom passed by certain species of plants, and of animals which do not wander far from their fixed habitation either with respect to elevation or latitude.

COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814

According to all the authorities we have examined on the distribution of plant life; on the migration of plants and animals; on climate and time as affecting the transference of isothermal and isochimenal lines; on glacial and inter-glacial periods (with one important exception only), the assumption maintained is substantially that of Mr. Renfrey, that "each species of plant and animal was created but once in time and place," and that its present diffusion is the result of its "own law of reproduction under the favorable or restrictive influences of laws external to it."

Life: Its True Genesis R. W. Wright