The Philosophical magazine; a journal of theoretical, experimental and applied physics . \st Period.—Let us suppose two caverns, a lower, A, and anupper, B C, communicating with each other by a long rent or pipeP. This pipe may be supposed of any height, sufficient when filledwith water to produce the required force. The lower cavern is supposed to be nearly at the level of the and other marine animals will perforate or attach them-selves to the bottom and sides of the cavern ; and if the sea entirelyfill it, the roof too, or at least that portion adjacent to the mouth ofthe caver
The Philosophical magazine; a journal of theoretical, experimental and applied physics . \st Period.—Let us suppose two caverns, a lower, A, and anupper, B C, communicating with each other by a long rent or pipeP. This pipe may be supposed of any height, sufficient when filledwith water to produce the required force. The lower cavern is supposed to be nearly at the level of the and other marine animals will perforate or attach them-selves to the bottom and sides of the cavern ; and if the sea entirelyfill it, the roof too, or at least that portion adjacent to the mouth ofthe cavern, may be similarly affected. The rocks in which thesecaverns occur may be of any geological age. •2nd Period.—By the gradual or quick upheaval of the strata inwhich these caverns occur, they may become dry. Discovery of Remains of Human Art with Bones of Animals. 299 During the rising, or at a later period, fragments of rock mayhave accumulated at the open mouth of the lower cavern, and thus. have stopped up its entrance, leaving the roof, sides, and floorsbearing evident traces of having been an ocean cave. 3rd Period.—Ages may have elapsed during which other stratamay have been depositing in other portions of our globe. Butultimately the earth became inhabited by those ancient, but nowextinct mammalia, whose remains abound in its caverns. Fig. 3.
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