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So down to the floor this heavy carbonic acid comes, and lies along it, just as it lies often in the bottom of old wells, or old brewers' vats, as a stratum of poison, killing occasionally the men who descend into it. Hence, as foolish a practice as I know is that of sleeping on the floor; for towards the small hours, when the room gets cold, the sleeper on the floor is breathing carbonic acid.
One step, more or less, might make all the difference, by-and-by. Now listen, while I work. What a God-send for us that there happens to be, just here, this stratum of soft sand. We should have been done for, had the cliff been serpentine marble. You must choose between two plans.
As all the above-mentioned Purbeck marsupials, belonging to eight or nine genera and to about fourteen species, insectivorous, predaceous, and herbivorous, have been obtained from an area less than 500 square yards in extent, and from a single stratum no more than a few inches thick, we may safely conclude that the whole lived together in the same region, and in all likelihood they constituted a mere fraction of the mammalia which inhabited the lands drained by one river and its tributaries.
Things go well with him. He rises from stratum to stratum of that commercial system whose geology is the ever-eluding study of the toilers of the street. He grows rich. His store begins to spread with the pressure of new enterprises. His house begins to blossom into the rich bloom of luxury. He is greeted with a new respect. He is courted with an eagerness he never knew before.
But this is only a particular stratum; and the general appearance of the sand-stone, as well as other strata in the coal countries, is that of having been little affected by those subterranean operations of heat by which those bodies in the alpine country have been changed in their structure, shape, and position.
Here our author seems to have deceived himself, by taking a very partial view of things which should be fully examined, and well understood, before general conclusions are to be drawn from those appearances; for, although those particular objects may not be visible in the strata which he has enumerated, or many others, they are found in those strata which are either immediately connected and alternated with them, or with similar strata; something to that purpose I think I have said; and, if I had not, it certainly requires no deep penetration to have seen this clear solution of that appearance of those objects not being found in every particular stratum.
In a general way strata are laid in well-nigh horizontal sheets, for the surface on which they are laid is generally of very gentle inclination. Each stratum, however, is lenticular, or lenslike, in form, having an area where it is thickest, and thinning out thence to its edges, where it is overlapped by strata similar in shape.
Over this a later stratum was deposited called tufa granolare, consisting of a similar mechanical conglomerate of scoriæ, ashes, and other volcanic products, but more porous and friable in texture. It is in this last formation, which is so soft that it can be easily hollowed out, and yet so solid that it does not crumble, that the Catacombs are invariably found.
I conversed with him merely upon ordinary topics, and, at another time, should have been much amused by the singular mixture of impudence and shrewdness which formed the stratum of his character.
The strata formed at the bottom of the ocean are necessarily horizontal in their position, or nearly so, and continuous in their horizontal direction or extent. They may change, and gradually assume the nature of each other, so far as concerns the materials of which they are formed; but there cannot be any sudden change, fracture, or displacement, naturally in the body of a stratum.
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