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moderate, they are not much exposed to ex-plosive mixtures.

In all the workings shewing the least ap-pearance of fire-damp, the miners are sup-plied with lamps, and are particularly cau-tioned to use them on first entering whenbeginning to work, where, being satisfied ofsecurity, they occasionally resort to candlesafterwards. This application of the lampalone, is of the greatest utility, and preventsmany slight explosions, and the miners frombeing burned ; besides superseding the ne-cessity of depending on the j udgment or dis-crimination of any individual to prove theexistence of the fire-damp, as in the oldmethod, by the candle flame.

From the repeated proofs made with thelamps, we cannot too strongly express ourconfidence in their security.

By experiment, a pint of oil, value six-pence, will about supply a lamp for sixdays, the ordinary time of a man’s working,so that they are cheaper than candles.

If my humble testimony can in any de-gree promote the speedy use of the lamp inother places, it will give me great pleasure.”

J. Peile.