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The subject of the means of producing artificial cold, or the constitution of frigorific mixtures, I had considered as exhausted, in the Papers I have already had the honour to lay before this Society : so far as relates to that part of the subject which consists in generating artificial coldwithout the use of ice, it still remains so with me, having nothing new to offer. A considerable acquisition however having been made, since my last Paper “On the best Methods of producing artificial Cold,” by the discovery that a neutral salt, but little known, or attended to, by chemists before, produced extraordinary effects of this kind with ice, it could not fail of attracting my attention.

IV. On the production of artificial cold by means of muriate of lime