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Before I enter into a detail of the new experiments I have made in the prosecution of this subject, I must beg leave to rectify some mistakes I have fallen into in my last paper. I. In computing the quantity of acid taken up by 10,5 gr. of mild vegetable fixed alkali, I made no allowance for the small quantity of earth it contains,viz . 0, 7035 of a grain; but in large quantities of alkali, this proportion is considerable, and occasioned a small but sensible error in my subsequent calculations of the proportion of ingredients in neutral salts, the quantity of alkali being, by that fraction, less than I supposed it in 10,5 gr. This correction being made, it will be found, that 100 gr. of perfectly dry vegetable fixed alkali (abstracted from the quantity of earth) generally contain 22,457 gr. of fixed air instead of 21, as I before determined; yet the former determination is right, where the earth is not separated, yet may well be supposed to exist, as in the alkali of pearl-ash, purified by three repeated calcinations and solutions.

XIV. Continuation of the experiments and observations on the specific gravities and attractive powers of various saline substances