CARRONIC ACID GAS.
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Mtssrs Editors-I have recently seen in your pa- per in account of two of suspended animatlon

 from the inhalation oI carbonic acid gas, at the bottom of we'll and the restoration of the indiv- duals to life by pouring cold water upon them The idea suggested, is regarded new but IS not so

 Carbonic acid gas is one of the constituents of at- mospkerc air; and is considered the heaviest of the three components, and falls, by it's gravity into the lowest places. It is in this way that it is found ge- nerally in wells, pits and caverns. When undilut- ed by atmospheric air. it is one of the most deadly and fatal poisons to animal life, suspendlng at once all the phenomena of life and extingulshlng 1t soon It also extingushes flame with the same rapidity and hence lighted candle, or torch, let down into a well, will immediately indicate the existence of this gas for flame will not exist in itt destroys