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The sides of the double inclined plane of the upper or dorsal surface also share in this depression occasioned by the evaporation of the fluid constituents; and a time comes when these sides are so depressed that a section of the pseudochrysalis through a plane perpendicular to its axis would be represented by a curvilinear triangle with blunted corners and inwardly convex sides.
The canal must be sunk or raised at intervals; there will, therefore, at various points be the need of a wall of great strength and durability, from one hundred and thirty to three hundred feet in height or depth. The annual rain-fall in the river region between Lake Nicaragua and the Caribbean Sea is twenty feet; annual evaporation, three feet.
A landowner at Malta possessed a rocky plateau sloping gradually towards the sea, and terminating in a precipice forty or fifty feet high, through natural openings in which the sea-water flowed into a large cave under the rock. The proprietor attempted to establish salt-works on the surface, and cut shallow pools in the rock for the evaporation of the water.
Also, will it pay to put it on a large field of alfalfa? The land is adobe. I can get slaked lime for the hauling, distance being about five miles. The lime will make the land more friable and, therefore, less disposed to bake and lose moisture by evaporation. Alfalfa is hungry for lime and is generally advanced by the application of it. Fertilizing Alfalfa. Can new cow manure be put on alfalfa?
The road is very fatiguing; yet, instead of making a new one, it would perhaps be better to change the bed of the river, which loses a great quantity of water by the combined effects of filtration and evaporation. Each sinuosity forms a marsh more or less extensive. This loss of water is to be regretted in a province, nearly all the cultivated portions of which are extremely dry.
Spirit of glyceryl trinitrate or spirit of Nitroglycerin, dose 1 minim, keeps well if care is taken to guard against evaporation of alcohol; tablets if well made and kept in bottles properly corked, will retain their activity for months. The closer a physician is to the laboratory, the less he believes in the value of nitroglycerin in hypertension.
Along the water's edge, and about three feet above it, was observed very clearly on the smooth face of the rocky slopes of Kabogo the high-water mark of the lake. This went to show that the Tanganika, during the rainy season, rises about three feet above its dry season level, and that, during the latter season, evaporation reduces it to its normal level.
We employed our time in completing the Flora of Cumana, geologically examining the eastern part of the peninsula of Araya, and observing many eclipses of satellites, which confirmed the longitude of the place already obtained by other means. We also made experiments on the extraordinary refractions, on evaporation and on atmospheric electricity.
The aspect of the spot, and the experience of half a century, have proved that the level of the waters is not invariable; the waste by evaporation, and the increase from the waters running into the lake, do not uninterruptedly balance each other.
My friend, Mr. H., had an hygrometer, which he kept in a small room adjoining that in which he usually sat; and this hygrometer afforded the ground-work for our theories. It proved most satisfactorily that the evaporation exceeded every thing of the kind known in any other part of the globe. It was clear that our atmosphere was drier than that of a brick-kiln when burning its best.
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