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in breadth. If the wire-gauze cylindersare larger, there is too much heat producedin them by the combustion of explosivemixtures.

In gas manufactories, spirit warehouses,or druggists’ laboratories where ether isdistilled, the common safety lamp maybe advantageously used.—A simple modeof exhibiting its power is furnished bythrowing a little ether into the bottomof a large jar; the vapour of the ether,mixing with the air, will produce an explo-sive atmosphere, which will burn withinthe wire-gauze without inflaming the etherin the bottom of the jar.

If pure hydrogene should be disengagedin any mines, the improbability of whichhowever is very great, wire-gauze of a finertexture must be employed.—This materialindeed, it is likely, will be found to possessmany new applications, not only in guard-ing against the communication of flame,but likewise in exerting cooling agencies,wherever elastic media can be exposed toit, so as to have their temperatures loweredby its radiation.

I shall now conclude. Whatever may