TAB 507 



Pix LiQuiDA. Tar. (U. S. & B. P.) 



An empyreumatic oleoresin obtained by the destructive 

 distillation of the Wood of Pinus palustris Miller, and of other 

 species of Pinus (nat. ord. ConiferaB). 



Synonym. — Kesina 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, methylio alcohol ; 

 3, creosote ; 4, guaiacol ; 5, phenol ; 6, pyrocatechin ; 7, toluol ; 

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



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

 D.,m^v.-3i. (1-4.). 



PREPARATIONS. 



Unguentum Picis Llquidm. Tar Ointment. (U. S. & B. P.) 

 Tar, 500 ; yellow wax, 150 ; lard, 350. 



Pix Carbonis Preparata. Prepared Coal Tar. (B. P.) 

 Liquor Picis Carbonis. Solution of Coal Tar. (B. P.) 



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 Nigea. 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, Eetina 

 (CisHjs). 



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