BOOK XII . 561 … A — Vat in which the soda is mixed . B — Caldron . C — Tub in which chrysocolla is CONDENSED . D — COPPER WIRES . E — MORTAR . Saltpetre 9 is made from a dry , slightly fatty earth , which , if it be re tained for a while in the mouth , has an acrid and salty taste . This earth , together with a…
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