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stantly be changed to black, by the sulphuretted hydrogen gas, withwhich the water is impregnated, acting on the oxide. A lady paintedwith this powder was sitting in a lecture-room, where water impreg-nated with sulphuretted hydrogen gas was handed round for inspec-tion. On smelling this liquid the lady in question became suddenlyblack in the face. Every person was of course alarmed by thissudden chemical change; but the lecturer explaining the cause ofthe phenomenon, the lady received no further injury than a practicallesson to rely more upon natural than artificial beauty in future.Another While. To one part of Venice talc, pulverized, put two partsof oil of camphor; let them digest in the water-bath till the wholebecomes very white.A White Salve which may be used for Paint. Take Jiv of very whitewax, Jv of oil of bitter almonds, Jj of very pure spermaceti, Jjssof white lead washed in rose water, and Jj of camphor. Mix thewhole up into a salve.

Palliatives are medicines given to relieve when a cure is hopeless.

Palma Christi. The Ricinus communis which furnishes castor oil.See Oleum Ricim.

Palm Oil. Palmce oleum. P. Procured from the Palma oleosa, orCocos buti/racea. See Coci Butyr.

Panacea Mercurialis. O. Corrosive Sublimate.

Panada. Put a glass of white wine or half a glass of rum into two tofour glasses of water, with a little sugar and lemon-peel, or nutmeg ;bring to boil, and then put in some grated bread till it is of a properthickness.

Panchymagogum Minerale. O. Corrosive Sublimate.

Pansy, or Heart's Ease. See Viola.

Papaveris Capsule. L. E. D. P. Poppy Heads, or Capsules. Papa-ver somnij'erum, Papaver album. D. This plant is extensively cul-tivated on the Continent, and also near London, for the sake of itsseed capsules, which furnish a decoction, an extract, jrti oil, and asyrup; which will be found under those respective articles. Theycontain the narcotic principle of opium, which is itself prepared fromthem. It is necessary in purchasing poppy-heads to ascertain thatthey are fresh, as their properties are greatly injured by long orimproper keeping.Enters into Syr. Papaveris. L. E. D.

Papaveris Decoctum. See Decoct. Papav.

Papaver Rh<eas. See Rhceados Pet.

Paracelsus's Plaster. See Emplastr. Stict.

Paregorics are medicines which soothe pain.

Paregoric Elixir. See Elixir Paregoricum.