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In the Tahoe Reserve the preservation of the forest cover is essential to the holding of snow and rain-fall, preventing rapid run-off, thereby conserving much of what would be waste and destructive flood-water, until it can be used for irrigation and other beneficial purposes.
No one denies that all the changes going on over the earth's surface conform to physical laws; but then no one pretends that there is any single proximate principle which governs all the phenomena of rain-fall, of soil-crumbling, of magnetic variation, and of the distribution of plants and animals.
As a crime, it is worse than murder, for it is an attempt at wholesale though slow extermination. The sorcerer or the witch who deliberately attempts to prevent rain-fall becomes the object of intense hatred on the part of all. The whole cluster of men assembled felt the gravity of the charge.
Gradually this leafy carpet grows in strength and thickness; like some great sponge it sucks up and retains the waters of the snows of winter, with those of the increased rain-fall of summer. "Thousands of mountain torrents, the beginnings of destructive floods, are thus checked, absorbed and shorn of their disintegrating energies.
His pluviometrical measurements, continued for three years, 1866-1868, show that during that period the annual mean of rain-fall in the centre of the wooded district of Cinq-Tranchees, at Belle Fontaine on the borders of the forest, and at Amance, in an open cultivated territory in the same vicinity, was respectively as the numbers 1,000, 957, and 853.
The heavy rain of the previous night unfortunately prevents us from following it to its source, a delightful excursion in tolerably dry weather, but impracticable after a rain-fall. By far the best, way is to sleep at Monthier and visit the source on foot, but fatigue may be avoided by taking a carriage from Pontarlier.
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.
Give the future American botanist the physical geography of a country its average rain-fall, temperature, etc., and the plant zone in which it lies, and, whether explored or unexplored, he will give us the general character of its vegetation, and name most of the plants and trees peculiar to its soil.
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