Resin or Rosin. The residue of the distillation of the Turpentines from various species of Pinus and Abies. The colour of the Resin depends upon the amount of heat employed in this process; the greater the heat, the darker the colour.

* Braithwaite's Retrospect of Medicine, &c, vol xxiv. p. 130. Presse Med. Beige, April 1855.

Med. Times and Gaz., Nov. 1, 1856; quoted in Pereira, Ed. 1857.

Mel. Prop, and Action. It is never given internally; finely powdered, it is occasionally applied as a styptic to recent wound*. It is a component in many plasters and cerates. The Ointment is useful in cases of foul and indolent ulcers. Under the name of Colophania, Resin has been proposed as an anti-periodic, but on insufficient grounds.

Offic. Prep. 1. Emplastrum ResinAe (Resin in powder oz. iv.; Litharge Plaster lb. ij.; Hard Soap in powder oz. ij. To the Litharge Plaster previously melted with a gentle heat, add the Resin and Soap, first liquefied, and heat them together until thoroughly mixed).

2. Unguentum Resinae (Powdered Resin Oz

viij.; Yellow Wax oz. iv.; Simple Ointment oz. xvj. Melt with a gentle heat, strain through flannel, and stir constantly until it cools). A substitute for Basilicon Ointment, Ceratum Resins (Pharm. Lond.).