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Updated: June 22, 2025
Every wind that blows is determined by influences partly solar, partly lunar, partly hygrometric; and implies considerations of fluid equilibrium and physical geography. The direction, dip, and variations of the magnetic needle, are facts half terrestrial, half celestial are caused by earthly forces which have cycles of change corresponding with astronomical periods.
"Neither touch nor sight can come into play, for the grub is sealed up in its burrow at a depth of several inches; nor the scent, since it is absolutely inodorous; nor the hearing, since its immobility is absolute during the daytime." The Processional caterpillar of the pine-trees, "endowed with an exquisite hygrometric sensibility," is a barometer more infallible than that of the physicists.
'In no part of England could a climate be found more unfavourable for consumptive invalids than that of Florence, a town built in a deep ravine, almost surrounded by the Apennines, and intersected by a squalid river.... Extreme cold in winter, great heat in summer, the prevalence of the northerly winds, the chilling effects of which are not always neutralised by the antagonistic winds, rapid and violent transitions, profoundly affecting the system, even in healthy persons; and combined with these violent atmospheric and thermal variations are also, in similar proportions, hygrometric and electric ever-changing influences. Leghorn, the seaport of Tuscany, is built in a sunk locality, in the midst of a marshy country.
Wherever the hygrometric, thermometric, telluric, and other conditions favor, the class of vegetation indicated by the presence of these conditions makes its appearance, just as the fire-weed makes its appearance in our warm temperate zone, not from the presence of seed, but simply the presence of "conditions" the provision of man harmonizing with the prevision of nature.
The plant in question has long been a native of Japan, which lies in the same warm temperate zone as the southern states. The same general hygrometric and thermometric conditions prevail throughout the two countries or sections of country.
It has to be corrected not only for nutation of the earth's axis and for precession of the equinoxes, but for aberration and for refraction; and the formation of the tables by which refraction is calculated, presupposes knowledge of the law of decreasing density in the upper atmospheric strata; of the law of decreasing temperature, and the influence of this on the density; and of hygrometric laws as also affecting density.
M. Ch. It may also be said to have its hygrometric and telluric gauges, or instruments to determine the necessary conditions of moisture and soil-constituents. When the temperature is below zero, the physiological functions of the plant are suspended, either in temporary hybernation or death.
These objections do not lie against the thallium paper, the oxidation to brown oxide by either ozone or hydrogen peroxide not requiring the presence of moisture, and the color, therefore, being independent of the hygrometric state of the air. Moreover, when well cared for, the papers undergo no farther change of color and may be preserved indefinitely.
This dampness exists particularly upon the surface of the plate; is obviously derived immediately from the atmosphere; and is owing to a certain relative temperature of the plate with the hygrometric condition of the atmosphere.
So that, at whatever period this fern originally made its appearance in either locality, it unquestionably found the exact thermometric, hygrometric, telluric, and other conditions necessary for the development of its vital germs.
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