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On that basis of growth the latest return falls nearly four millions short. The sharp demarcation of the western frontier by the grasshopper and the hygrometer is another, which will continue to operate until, by irrigation, tree-planting or some other device, a new climate can be manufactured for the Plains.
But let me state that it is on the barometer that I now place my somewhat limited reliance on a hunting morning, and not on the hygrometer, on the weight of the column of air on a given point of the surface of the earth, rather than on the state of the evaporations, the relative humidity, and the dew point.
Appalled and paralyzed, he sat immovable whilst he beheld an actual mouse, unrestrained by any scientific considerations, place its profane snout in the bowl of the hygrometer, and drink deliberately until its thirst was satisfied. It then retired, and other mice soon came trotting along the table and did the same. Mr. H. is a man of great self-control.
The fact, however, turned out quite the contrary. The hygrometer gave a difference of 29.6 degs., between the temperature of the air, and the point at which dew was precipitated. This difference was nearly double that which I had observed on the previous mornings. This unusual degree of atmospheric dryness was accompanied by continual flashes of lightning.
During the night there was a very curious optical phenomenon, which I shall not undertake to account for. At half-past midnight the wind blew feebly from the east; the thermometer rose to 23.2 degrees, the whalebone hygrometer was at 57 degrees. I had remained upon the deck to observe the culmination of some stars. The full-moon was high in the heavens.
On the twenty-fourth day of December, 1803, at two o'clock, P.M., the thermometer standing at 79, hygrometer 17, barometer 29.880, sky partly clouded, wind west, light, the apothecary of the rue Royale, now something more than a month established in his calling, might have been seen standing behind his counter and beginning to show embarrassment in the presence of a lady, who, since she had got her prescription filled and had paid for it, ought in the conventional course of things to have hurried out, followed by the pathetically ugly black woman who tarried at the door as her attendant; for to be in an apothecary's shop at all was unconventional.
No factory could have supplied a more handsome or tasteful one. In the instrument-screen we had a thermograph, hygrometer, and thermometers. Observations were made at 8 a.m., 2 p.m., and 8 p.m. When I was at home I took them, and when I was away it was Lindström's work.
These tables of factors have been constructed at the Greenwich Observatory, and are generally used. The Hygrometer, invented by Mr. Daniell, gives the dew-point by inspection. It is an error to suppose that dew falls like rain from the air; it forms on the body which is cooled down below the temperature of the air.
In the plains, on the contrary, many trees are stripped of a part of their leaves during the winter; and when we descend into the valley of the Tuy, we are struck with the almost hibernal aspect of the country. The dryness of the air is such that the hygrometer of Deluc keeps day and night between 36 and 40 degrees.
Something in the seed we plant avails itself of the heat and the moisture. The relation is not that of a thermometer or hygrometer to the warmth and moisture of the air; it is a vital relation. Life may be called an aquatic phenomenon, because there can be no life without water. It may be called a thermal phenomenon, because there can be no life below or above a certain degree of temperature.
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