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As soon as the rain ceased, it was curious to observe the extraordinary evaporation which commenced over the whole extent of the forest. At the height of a hundred feet the hills were buried in a dense white vapour, which rose like columns of smoke from the most thickly wooded parts, and especially from the valleys. I observed this phenomenon on several occasions.
The whole of these experiments, made in the latitudes of 41 and 49 degrees, and at 10.5 and 16 degrees of mean temperature, indicate a mean evaporation of one line, or one and three-tenths a day. In the torrid zone, in the West India Islands for instance, the effect of evaporation is three times as much, according to Le Gaux, and double according to Cassan.
"A very worthy fellow, Willis, and I know it," replied Becker, shaking him heartily by the hand. To the storm succeeded one of those diluvian showers that have already been described. Rain being merely a result of evaporation, it was evident that sea and land in those climates must perspire at an enormous rate to effect such cataclysms.
Evaporation is so rapid at this high altitude that if you wet the back of your hand it dries almost instantly, leaving a smart sensation of cold.
Tiles used for the top covering are sometimes made with circular depressions for holding water for evaporation. STEAM. The employment of steam for heating green houses, graperies, &c., is almost entirely superceded by the hot water method. It will, therefore, be necessary only to allude briefly to this part of our subject.
He applied his nose judicially to the auger-hole in the barrel's top. He estimated the amount of spirits in each. "I wouldn't have believed it," he said, "if I hadn't seen it. It's because you varnished the barrels. That made evaporation slow. I'll give you twenty dollars a gallon for all there is of it." "I'll take it," said John Appleman.
There is no doubt that in exceedingly wet seasons the whole valley is one continuous stream, when all the lakes would be united and present a truly magnificent appearance; but as the area of evaporation is so large, and the banks of many of the lakes are high, the quantity of rain must be enormous before the valley becomes filled with a running river.
Although they had most carefully husbanded their water, it was now growing very scarce. Not a drop of rain had fallen by which it could be replenished. They had wisely covered up the casks with planks and boughs, so as to keep them from the heat, and to diminish the evaporation as much as possible. Still, in that climate, a good deal of water, they knew, must thus be lost.
If the steam baths are well protected from dust, solutions should be left without covers during evaporation; but solutions which are boiled upon the hot plate, or from which gases are escaping, should invariably be covered.
Before it is moved, even before it is cut loose from its point of support, the fragment is modelled into the shape of a sphere. The beetle as geometer is aware of the form best adapted to the long preservation of preserved foods. The ball is soon ready. It must now be forced to acquire, by means of a vigorous rolling, the crust which will protect the interior from a too rapid evaporation.
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