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The retention of such markings depends on other circumstances than the mere hardness of the rock, or amount of aqueous action. The Lachoong is here twelve or fifteen yards wide, and runs over a pebbly bed, cutting a shallow channel through the deposits, down to the subjacent rock, which is in some cases scooped out six or eight feet deep by its waters.
Thus, we have a species of coal in which we shall find but a small degree of fusibility, although it may not be charred in any degree. Such an infusible coal may therefore contain a great deal of aqueous substance, and volatile oily matter; consequently may burn with smoke and flame.
Generally speaking, they could not see far around them; a few hundred yards off, all seemed entombed in the fearfully big billows, with their frothing crests shutting out the view. They felt as if in an enclosure, continually altering shape; and, besides, all things seemed drowned in the aqueous smoke, which fled before them like a cloud with the greatest rapidity over the heaving surface.
These run into each other through an intermediate group, which are neither good conductors nor good insulators. The following are the chief examples of these classes: CONDUCTORS. All the metals, carbon. Water, aqueous solutions, moist bodies; wood, cotton, hemp, and paper in any but a dry atmosphere; liquid acids, rarefied gases.
Some of these are identical with those produced by the action of our own atmosphere, especially one or more groups due to aqueous vapours; others are of unknown origin; and it is remarkable that one among the latter a strong band in the red agrees in position with a dark line in the spectra of some ruddy stars.
The student, instead of being encouraged with the hope of interpreting the enigmas presented to him in the earth's structure instead of being prompted to undertake laborious enquiries into the natural history of the organic world, and the complicated effects of the igneous and aqueous causes now in operation was taught to despond from the first.
Special Influence of Woods on Precipitation. With the question of the action of forests upon temperature and upon atmospheric humidity is intimately connected that of their influence upon precipitation, which they may affect by increasing or diminishing the warmth of the air and by absorbing or exhaling uncombincd gas and aqueous vapor.
Hence, if the atmosphere at the earth's surface became super-saturated with aqueous vapour, dew would be continuously deposited, especially on every form of vegetation, the result being that everything, including our clothing, would be constantly dripping wet.
In the formation of stalactical concretions, besides the incrustation as well as crystallization of the stony substance from the aqueous vehicle by which it had been carried in the dissolved state, we have the other necessary accompanyments of the operation, or collateral circumstances of the case.
Seeing that, in most cases, they would be hermetically enclosed in molten and quickly solidifying silica they could not be acted on to any great extent by aqueous agency. Neither does Mr.
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