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Updated: May 16, 2025
So that, to get materials for further advance, astronomy requires not only the indirect aid of the sciences which have presided over the making of its improved instruments, but the direct aid of an advanced optics, of barology, of thermology, of hygrometry; and if we remember that these delicate observations are in some cases registered electrically, and that they are further corrected for the "personal equation" the time elapsing between seeing and registering, which varies with different observers we may even add electricity and psychology.
His observations for temperature, pressure, variation, hygrometry, and psychrometry of the Orotavan climate, which he chose for health, are valuable. He starts with a theory of the three conditions of salubrity heat-and-cold, humidity, and atmospheric change. 'in the murmurs of the breeze the legends of races long disappeared.
A sportsman, out in all weathers, and often dependent for success on his knowledge of "what the sky is going to do," has opportunities for becoming a meteorologist which no one beside but a sailor possesses; and one has often longed for a scientific gamekeeper or huntsman, who, by discovering a law for the mysterious and seemingly capricious phenomena of "scent," might perhaps throw light on a hundred dark passages of hygrometry.
How shall it decide? The more I look into the matter, the more do my suspicions fall upon the atmospheric influence which is felt through the two open ends. Of what does this influence consist? Is it an effect of pressure, of hygrometry, of electrical conditions, of properties that escape our coarser physical attunement? He were a bold man who should undertake to decide.
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