635

Preparations and Compositions. Part III.

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fats are ready for straining, which should be done througha linen doth without expression. The residuum may be re-peatedly melted with a little water, until it become discolour-ed with the fire. The fluid fat should be poured into thevessels, or bladders, in which it is to be preserved.

These articles had formerly a place also among the prepa-rations of the Edinburgh college. But now they introducethem only into their list of the materia medica; as the apo-thecary will, in general, find it more for his interest to pur-chase them thus prepared, than to prepare them for himself;for the process requires to be very cautiously conducted, toprevent the fat from burning or turning black.

CERA FLAVA PUFIFICATA. Did).

Purijicd Yellow Wax,

Take of

Yellow wax, any quantity.

Melt it with a moderate heat, remove the scum, and after al-lowing itjto settle, pour it cautiously off from the faces.

Yellow wax is so often adulterated, that this process is byno means unnecessary.

LlNIMENTUM SIMPLEX. Ed.

Simple Liniment.Take of

Olive oil, four parts;White wax, one part.

This consists of the same articles which form the Unguen-tum simplex of the Edinburgh Pharmacopoeia, but merely ina different proportion, so as to render the composition thin-ner ; and where a thin consistence is requisite, this may beconsidered as a very elegant and useful application.

Unguentum simplex. Ed.Simple Ointment.Take of

Olive oil, five parts ;White wax, two parts.

Both these ointments may be used for softening the skinand healing chaps.

Unguentum cetacei. Lond-Ointment of Spermaceti.Take of

Spermaceti, six drachms: u