Paraffinum Molle. Soft Paraffin. (Vaseline). A white or yellow, 

 translucent, soft, unctuous, mixture of the softer members of the paraffin 

 series. Melts at 96-102 F. (35.5-38.9 C.). Insoluble in water, 

 slightly soluble in absolute alcohol, readily soluble in ether, chloroform and 

 benzol. 



Paraldehydum. Paraldehyde. Dose, #-2 fl. dr.; 2-8 c.c. 

 A clear colourless liquid, with a characteristic odour and an ethereal, 

 acrid and afterwards cool, taste. Soluble 1 in 10 of water, miscible in 

 alcohol and ether. 



Pareira Radix. Pareira. Root. The dried root of Chondrodendron 

 tomentosum. In long nearly cylindrical and somewhat twisted pieces, 

 from 3/4-2 inches or more in diameter; covered with a thin black bark 

 with numerous furrows, ridges and fissures; internally greyish: no odour, 

 taste bitter. 



Extractum Pareirae Liquidum. Dose, *4-2 fl. dr.; 2-8 c.c. 

 Aqueous and alcoholic. 



Pepsinum. Pepsin. Dose, 5-10 gr.; 3-6 dgms. 



The enzyme obtained from the stomach of the pig, sheep or calf. It 

 should be capable of dissolving 2,500 times its weight of hard-boiled white 

 of egg. 



1 Glycerini Pepsini. Dose, 1-2 fl. dr.; 4-8 c.c. 

 9.15; Hydrochloric Acid, 1.15; Glycerin, 60; Water, to 100. 



Phenacetinum. Phenacetin. Dose, 5-10 grs. 3-6 dgms. 

 Paraacet-phenetidin. C 2 H 5 O.C 6 H4.NHCOCH 3 . White tasteless, inordor- 

 ous, crystals, neutral to litmus. Soluble, 1 in 1,700 of water, 1 in 21 of 

 alcohol. 



Phenazonum. Phenazone. (Antipyrine.) Dose, 5-20 grs.; 3-12 

 dgms. 



Phenyldimethyl-iso-pyrazolone. Colourless, inodorous, scaly crystals, 

 with a bitter taste. Soluble, 1 in 1 of water, 1 in a little more than 1 of 

 alcohol. Incompatibles, ferric chloride (gives a red colour), syrup of fer- 

 rous iodide, calomel, mercuric chloride, solution of arsenic and mercuric 

 iodides, iodine, potassium permanganate, tannic acid, spirits of nitrous 

 ether and other solutions containing nitrites (a green colour being produced), 

 chloral (in strong solutions) ; triturated with sodium salicylate a mass or 

 liquid is formed; with thymol, acetananilid, and resorcin a liquid is formed. 



Phosphorus. Phosphorus. Dose, in pill or solution, 1/100-1/20 

 gr.; K-3 mgms. 



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