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Updated: June 22, 2025
From a point on the side of the mountain masses of vapour are seen to issue, and these unite to form a cloud over the summit; the outline of this vapour-cloud varying continually according to the hygrometric state of the atmosphere, and the direction and force of the wind.
The water due to the condensation of the gases is led through a small pipe out of doors or into a vessel from whence it may evaporate anew, so as not to change the hygrometric state of the air. The consumption of gas is very small, it taking but 250 liters per hour to heat a room of 80 cubic meters to a temperature of 18° C. Revue Industrielle.
Nevertheless, even these give some recognition of hygrometric necessities, and, though living on the water, and not merely christened with dewdrops like other leaves, but baptized by immersion all the time, they are yet known to suffer in drought and to take pleasure in the rain.
As for Tityus what is a bird more or less on a body that covers nine acres? He found the vultures a gentle stimulant to the liver without which it would have become congested. Sir Isaac Newton was intensely interested in the hygrometric and barometric proceedings of the Danaids.
Now at Cumana, where it sometimes does not rain during a whole year, and where I had the means of collecting a great number of hygrometric observations made at different hours of the day and night, the mean humidity of the air is 86 degrees; corresponding to the mean temperature of 27.7 degrees.
The weather may be foretold with considerable certainty, for a short time, from many hygrometric plants, and the atmospheric influence on animals. Von Os. And from Cloudology, by the changing of primary clouds into compound; and these resolving themselves into nimbi, for rain; or gathering into cumuli, for fair weather. This is like to become a very useful and pleasing science. Dov.
As soon, therefore, as the former subside, and the sun rises in the horizon, the humidity commences to shew itself in the atmosphere; whilst, on the contrary, when the diurnal winds cease, and the sun sets, the above hygrometric condition of the air disappears. M. Carrière cannot conceive why our countrymen prefer Nice to a milder climate, and considers that the annual mortality in the English colony ought to discourage other hectic invalids from going thither.
We have seen, further, that the forest is equally useful as a regulator of terrestrial and of atmospheric humidity, preventing by its shade the drying up of the surface by parching winds and the scorching rays of the sun, intercepting a part of the precipitation, and pouring out a vast quantity of aqueous vapor into the atmosphere; that if it does not increase the amount of rain, it tends to equalize its distribution both in time and in place; that it preserves a hygrometric equilibrium in the superior strata of the earth's surface; that it maintains and regulates the flow of springs and rivulets; that it checks the superficial discharge of the waters of precipitation and consequently tends to prevent the sudden rise of rivers, the violence of floods, the formation of destructive torrents, and the abrasion of the surface by the action of running water; that it impedes the fall of avalanches and of rocks, and destructive slides of the superficial strata of mountains; that it is a safeguard against the breeding of locusts, and finally that it furnishes nutriment and shelter to many tribes of animal and of vegetable life which, if not necessary to man's existence, are conducive to his rational enjoyment.
The Equatorial zone, for instance, is characterized by extreme luxuriance in growth, owing no doubt to the great heat and abundant moisture therein, and exhibits a vegetation which is peculiar to itself, and which could only thrive under the hygrometric, thermometric, telluric, and other conditions of that extensive zone.
There are other governing conditions, of course, such as the average rain-fall, distance from the equator, the elevation above the sea level in the various mountain systems of vegetation, etc., including the hygrometric, thermometric, telluric, and other conditions, of the several localities in which the different species of vegetation make their appearance.
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