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These carbonized fabrics may be subjected to much more severe tests with impunity; and when I tell you that they have been exposed to a bath of molten iron without injury, you will readily admit that they possess some qualities not ordinarily associated with charcoal.
The passage of the party up the river was slow, owing to unfavorable winds; and they observed along the banks many signs of early convulsions of nature. The earth of the bluffs was streaked with layers of coal, or carbonized wood, and large quantities of lava and pumice-stone were strewn around, showing traces of ancient volcanic action. The journal of April 9 says:
In favourable specimens, again, almost the whole ground substance appears to be made up of similar bodies more or less carbonized or blackened and, in these, there can be no doubt that, with the exception of patches of mineral charcoal, here and there, the whole mass of the coal is made up of an accumulation of the larger and of the smaller sacs.
As the power of an explosive depends principally on the amount of gas which results from its sudden combustion, it was evident that the addition of pure or nearly pure carbon, in a condition to be readily combined with the other elements, ought to increase materially the force of nitro-glycerine, and M. Roca experimented accordingly with an admixture of sugar, as a highly carbonized body immediately available, and found that three parts of this, mixed with seven parts of nitro-glycerine, detonated with a force from thirty to thirty-five per cent. greater than that of pure nitro-glycerine.
Moreover, the organic elements have absolutely nothing constant in their dimensions. Still, if we limit ourselves to a comparison of the same carbonized wood, preserved on the one hand by petrifaction, and on the other hand non-mineralized, we find a very perceptible diminution in bulk.
The elements have contracted in length, breadth, and thickness, but principally in the direction of the compression that they have undergone in the purely carbonized specimens.
Many of these fossilized and carbonized forms are identical with the living species of to-day, conclusively showing that neither natural variation, nor any secondary causes, have worked out any changes capable of being scientifically expressed in genetic value.
The waters derived from a prolonged steeping of vegetables, and charged with all the soluble principles extracted therefrom, have, after their sojourn in a proper medium, deposited the carbonized residua that have themselves become soluble, and have there formed masses of combustibles of a different composition from that resulting from the skeletons of plants, such as cannel coal, pitch coal, boghead, etc.
Here is a piece of carbonized cotton sheeting, which may be rolled or folded over without breaking, and, as you see, when placed in the flame of a Bunsen burner, the fibers may be heated white hot in the air, and when removed from the flame, the material shows no tendency to consume.
90. =Roast Beef with Yorkshire Pudding.= Have three ribs of prime beef prepared by the butcher for roasting, all the bones being taken out if it is desirable to carve a clean slice off the top; secure it in place with stout twine; do not use skewers, as the unnecessary holes they make permit the meat-juices to escape; lay it in the dripping pan on a bed of the following vegetables, cut in small pieces; one small onion, half a carrot, half a turnip, three sprigs of parsley, one sprig of thyme, and three bay leaves; do not put any water in the dripping pan; its temperature can not rise to a degree equal in heat to that of the fat outside of the beef, and can not assist in its cooking, but serves only to lower the temperature of the meat, where it touches it, and consequently to soften the surface and extract the juices; do not season it until the surface is partly carbonized by the heat, as salt applied to the cut fibre draws out their juices.
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