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 will be proper to add on this occasion the ensuing Experiment.

We took a competent quantity of acid spirit distill'd from Roch-allom, (that, though rectifi'd, was but weak,) which, in the spirit of that salt, is not strange. Of this we put into a wide mouth'd Glass (that was not great) more than was sufficient to cover the globulous part of a good seal'd Thermoscope, and then suffering the instrument to stay a pretty while in the liquor, that the Spirit of wine might be cool'd as much as the ambient was, we put in little by little some volatile salt sublimed from Sal Armoniac and a fixt Alcali, and notwithstanding the very numerous (but not great) bubbles, and the noise and froath that were produced, as is usual upon the reaction of Acids and Alcalys, the tincted spirit in the Weather-glass, after having continued a good while at a stand, began a little to descend, and continued (though but very slowly) to do so, till the spirit of Allom was glutted