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The substance is heated until the water and excess of free hydrochloric acid have been driven off; it is then moistened with a little hydrochloric acid, diluted with distilled water and heated. The undissolved residue is by filtering separated from the dissolved, the filter washed with distilled water, and the wash water added to the filtrate.
And if then any of it remain undissolved, pour fresh Spirit of Wine upon it, set it again into the Bath as aforesaid, all will be well dissolved; and if perhaps any more Fæces remain, they will be very few, cast them away, for they are good for nothing.
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