Prunum. Prunes. The dried ripe fruit of Prunus domestica. Contained in Confectio Sennæ.

Pterocarpi Lignum. Red Sanders Wood. (Red Sandal Wood.) The heart wood of Pterocarpus santalinus. Usually imported in logs. In chips it varies in colour from blood-red with lighter zones to a very dark brown; a slight astringent taste and a faint odour when warmed. The colouring matter is soluble in alcohol, and to a very slight extent in water. Used in the Compound Tincture of Lavender.

Pulveres. (The following, with a dose of 1 - 4 grs. Elaterini Comp.; dose 1 - 5 grs. Hydrargyrum cum Creta; with dose, 3 - 6 grs. Antimonialis; dose, 2 - 10 grs. Opii Comp.; dose 5 - 15 grs. Ipecacuanhæ Comp.; dose,

5 - 20 grs. Kino Comp.; dose, 10 - 20 grs. Scammonii Comp.; dose, 10 - 40 grs. Cretæ Aromaticus cum Opio, Cinnamomi Comp.; dose, 10 - 60 grs. Cretæ Aromaticus; dose, 20 - 40 grs. Catechu Comp.; dose, 20 - 60 grs. Jalapæ Comp., Rhei Comp., Tragacanthæ Comp.; dose, 60 - 120 grs. Gly-cyrrhizæ Comp.; dose, (60 - 120 grs.). Amygdalæ Comp.; Sodæ Tar-taratae Effervescens, q.v.)

Pyrethri Radix. The dried root of Anacyclus Pyrethrum. Pieces 2- 4 inches in length, 1/2 inch or more in diameter, nearly cylindrical or tapering towards each end: outer surface brown and wrinkled; odour characteristic, taste pungent and exciting a copious flow of saliva.

Tinctura Pyrethri

20; Alcohol 70% 100: by percolation.

Pyroxylinum. Pyroxylin. (Di-nitro-cellulose). Soluble readily in equal parts of ether and alcohol.

Collodium. 1Collodion. - 2; Ether, 72; Alcohol, 24.

1collodium Flexile

96; Canada Turpentine, 4; Castor Oil,2 -

Collodium Vesicans. Blistering Collodion. - 2.5; Blistering liquid, 100.

Quassiæ Lignum. The wood of the trunk and branches of Picræna excelsa. Imported in logs. Retailed in chips of a yellowish-white colour, very light and with a persistently bitter taste. As this bitter contains no tannin it may be prescribed with iron.

1Infusum Quassiæ. Dose, 1/2 - l fl. oz.; 15 - 30 c.c.-l; Water, 100.

3Liquor Quassiæ Concentratus. Dose, 1/2 - 1 fl. dr.; 2 - 4 c.c. - 10; Alcohol, 100; an alcoholic extract.

1Tinctura Quassiæ. Dose, 30 - 60 min.; 2 - 4 c.c. - 10; Alcohol 45%, 100: by maceration.