Preparations of Quicksilver. 1$$

crucible large enough to hold five or fix times thcquantity of the dry matter, to allow for its fwel-ling and ebullition. The fire rauft be moderate tilithis ebullition ceafes, and the matter becomes con-fiftent ; then increafed tili it flows thin at the bot-tom like oil, when it is to be poured into mouldsprevioufly heated and greafed; and, when congeal-ed, taken out, wiped clean from the greafe, and putinto glafs veffels clofe ftopped.

In want of iron moulds, Lewis direfts holes tobe made, with a fmooth and greafed ftick, in to-bacco-pipe clay, into which the matter may bepoured.

PR^EPA-