TAR 483 



Pix LiQUiDA. Tar. (U. S. <fe B. P,) 



An empyreumatic oleoresin obtained by the destructive 

 distillation of tlie wood of Pinus palustris Miller, and of other 

 species of Pinus (nat. ord. Coniferse). 



Synonym. — Resina empyreumatica liquida — goudron, 

 goudron vegetal, Fr.; theer, G. 



Habitat — United States. 



Properties. — Thick, viscid, semi-fluid, blackish-brown; 

 heavier than water, transparent in thin layers, becoming 

 granular and opaque with age ; odor empyreumatic, terebin- 

 thinate ; taste sharp, empyreumatic. 



Tar is slightly soluble in water ; soluble in alcohol, 

 fixed or volatile oils, and solutions of potassium or sodium 

 hydrate. 



Constituents. — Mainly — 1, oil of tar ; 2, metbyllic alcohol ; 

 3, creosote ; 4, guaiacol ; 6, phenol ; 6, pyrocatechin ; 7, toluol ; 

 8, xyol ; 9, acetic acid ; 10, acetone ; 11, resins. 



Dose.—R. & C, I ss.-i. (15.-30.) ; Sh. & Sw., 3 i.-ii- (4.-8.); 

 D.,11lxv.-3i. (1.-4.). 



PREPARATION. 



Unguentum Picis Liquidce. Tar Ointment. (IT. S. & B. P.) 

 Tar, 500 ; yellow wax, 135 ; lard, 875. 



Oleum Picis Liquids. Oil of Tar. (U. S. P.) 



A volatile oil distilled from tar. 



Properties. — An almost colorless liquid when freshly 

 distilled, but soon acquiring a dull, reddish-brown color, and 

 having a strong tarry odor and taste. Spec. gr. about 0.970. 

 Soluble in alcohol. 



Pix Nigba. Pitch. (Non-official.) 



A solid, shining, black, bituminous substance. Soluble 

 in ether, oils, and aqueous alkaline solutions. It con- 

 tains an altered resin, and a crystalline principle, Retine 



(CigHig). , 



