608 RESIN 



Terpinol, prepared by boiling terpene in water acidulated 

 with sulphuric acid, is a mobile liquid, with a strong aromatic 

 odour ; insoluble in water, but soluble in alcohol and 

 ether. Its actions are similar to those of terpene. Doses 

 for dogs and cats, Tl\iv. to H|xv. 



III. RESIN, ROSIN, RESINA. 



The crude turpentines contain 75 to 90 per cent, of resin 

 or colophony, developed by a process of oxidation. Crude 

 turpentine, when distilled with a little water, which the 

 resin retains, leaves a residue of yellow or white resin. 

 When the water is removed, the resin becomes transparent, 

 and when more strongly heated is still clearer, and is known 

 as black or fiddler's resin. These turpentine resins are types 

 of a considerable group of resins, derived chiefly from the 

 vegetable kingdom, distinguished by their appearance, 

 fusibility, inflammability, acidity to test-paper ; burning 

 with a smoky flame ; insoluble in water, and soluble in 

 alcohol, volatile oils, and alkalies. They unite with fats, 

 wax, and spermaceti, and are largely used in the. manu- 

 facture of yellow soap. Resin has the formula C 44 H 62 4 . 

 Coarsely powdered and shaken with warm dilute alcohol, it 

 undergoes hydra tion, and yields 80 to 90 per cent, of abietic 

 or sylvic acid (C 44 H 64 5 ). Bordeaux resin or gallipot 

 contains besides the isomeric pimaric acid. 



ACTIONS AND USES. Resin is a gentle stimulant, astrin- 

 gent, and diuretic. Two to four ounces, swallowed by horses 

 or cattle, cause diuresis. It is added to diuretic masses to 

 increase their consistence. Externally, it is used as a stimu- 

 lant, astringent, and styptic. In castration, a pinch applied 

 to the severed cord, and melted by the hot iron, helps to 

 seal bleeding vessels. It is largely used to impart firmness 

 and adhesiveness to stimulant plasters. Resin ointment is 

 made with eight parts each of resin, yellow wax, and olive 

 oil, and six of lard, melted with gentle heat, strained while 

 hot through flannel, and stirred constantly while it cools. 

 This simple ointment is much used as a lubricant, and mild 

 stimulant for wounds, ulcers, blistered surfaces, and for 

 giving bulk and consistence to other ointments. 



