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noise like that produced by the burning ofhydrogen gas in open tubes.

“ These extraordinary and unexpectedresults lead to many enquiries, respectingthe nature and communication of flame,but my object at present is only to pointout their application to the use of the col-lier.

“ All that he requires to ensure security,are small wire cages to surround his candleor his lamp, which may be made for a fewpence, and of which various modificationsmay be adopted, and the application of thisdiscovery will not only preserve him fromthe fire-damp, but enable him to apply it touse, and to destroy it at the same time thatgives him a useful light.”

3. On the Combustion of explosive Mixtures con-fined by Wire Gauze.*

(( I HAVE pursued my enquiries respectingthe limits of the size of the apertures and ofthe wire in the metallic gauze, which I haveapplied to secure the coal miners from the

* From Pan. Trans.