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AN APPENDIX,

Containing an account of fome experiments made by Mr. Hey, which prove that there is no oil of vitriol in water impregnated with fixed air extracted from chalk by oil of vitriol and also a letter from Mr. Hey, to Dr. Priestley, concerning the effects of fixed air applied by way of clyster.

Experiments to prove that there is no oil of vitriol in water impregnated WITH FIXED AiR.

It having been suggested, that air arising from a fermenting mixture of' chalk and oil of vitriol might carry up with it a small portion of the vitriolic acid, rendered volatile by the a£t of fer- mentation: I made the following experiments, in order to discover whether the acidulous taste, which water impregnated with such air affords, was owing to the presence of any acid, or only to the fixed air it had absorbed.

Experiment I.

I mixed a tea-spoonful of syrup of violets with an ounce of distilled water, saturated with fixed air procured from chalk by means of the vitriolic acid; but neither upon the first mixture, nor after standing: