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as long as those who write are ambitious of making Converts, and of giving their opinions a Maximum of Influence and celebrity, the most extensively circulated Miscellany will repay with the sreatest Effect the Curiosity of those who read, whether it be for Amusement or for Instruction.—Johnson. *...* Our Supplement, completing the 34th Volume, is published with the present Number.

ORIGINAL COMMUNICATIONS.

To the Editor of the Monthly Magazine. sIR, CCEPT the following easy method A of dispelling noxious air from large beer-backs, cistpools, the shafts of mines, and such like places. It may be done in any situation, and with very little labour; without any expense, and it is said to be effectual. The method is this—Where it is known to be unsafe, or may be suspected of being dangerous for men to descend, it is only necessary for them to throw any cold spring or other water, which is not putrid, two or three pailfuls, into the place containing the noxious air, in such a manner as to break the water into a very heavy shower: and, if I am rightly informed, that will dispel most of the suffocating gas, and correct the air so much as to remove every degree of danger. John MIDDLETon. Lambeth, Dec. 17, 1812. To the Editor of the Monthly Magazine. SIR, IT is with particular satisfaction that I am able to dispel the laudable anxiety expressed by your correspondent G. P. relative to the probability of means being found to ensure the safety of persons suffering the misfortune of shipwreck. A patent has within these few weeks been granted to a gentleman of Gibraltar, for the invention of rendering seamen's beds complete life-preservers. In one character, this gentleman has united two most important objects—a comfortable bed or mattress, possessing in every respect the same appearance, convenience, softness, and pliability, as those now in use, and at the same time having the extraordinary property of floating the body for any length of time— the simplicity of the construction enables a 'person to adjust them, in less than two minutes, without any risk of their being removed by accidents. MusIHLY MAG. No. 237,

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