The accounts of the perpetual lamps which ancient writers give have occasioned several ingenious men to search after their composition. Licetus, who possessed more erudition than love of truth, has given two receipts for making this eternal fire by a preparation of certain minerals. More credible writers maintain that it is possible to make lamps perpetually burning, and an oil at once inflammable and inconsumable; but Boyle, assisted by several experiments made on the air-pump, found that these lights, which have been viewed in opening tombs, proceeded from the collision of fresh air. This reasonable observation conciliates all, and does not compel us to deny the accounts. The story of the lamp of Rosicrucius, even if it ever had the slightest foundation, only owes its origin to the spirit of party, which at the time would have persuaded the world that Rosicrucius had at least discovered something. It was reserved for modern discoveries in chemistry to prove that air was not only necessary for a medium to the existence of the flame, which indeed the air-pump had already shown; but also as a constituent part of the inflammation, and without which a body, otherwise very inflammable in all its parts, cannot, however, burn but in its superficies, which alone is in contact with the ambient air. NATURAL PRODUCTIONS RESEMBLING ARTIFICIAL COMPOSITIONS. Some stones are preserved by the curious, for representing distinctly figures traced by nature alone, and without the aid of art.