The Philosophical magazine; a journal of theoretical, experimental and applied physics . 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. 4M Period.— Ages may again have intervened when man, in hisfirst rude state of existence, entering this deserted den through theopening its former
The Philosophical magazine; a journal of theoretical, experimental and applied physics . 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. 4M Period.— Ages may again have intervened when man, in hisfirst rude state of existence, entering this deserted den through theopening its former occupants had used, might have been glad toshelter himself from an inclement climate in this bone-house of amore ancient world. 300 Royal Society :— Durlna; this jteriod traces of mans skill would probably be leftwithin his miserable abode ; pottery, if he possessed the art; char-coal or charred wood, if he were acquainted with fire ; rude cuttinginstrumentsof flint or other hard stone, perhaps spear or arrow-heads. Fig. 4 represents the caverns at the end of the fourth period. Fie. 4.
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