422 YEGETABLE DRUGS 



posed of needles. It is bitter, and soluble in alcohol and 

 chloroform ; insoluble in water or ether. It contains digi- 

 toxin, digitalin, digitalein and digitonin, but mainly digi- 

 toxin, and is cumulative. Dose. — H. & C, gr.j-J (.015. 03); 

 I>-.gi--A-^V (-001-002). 



2. HomoUe's or Quevenne's digitalin, an amorphous, 

 whitish powder, or small scales; very bitter, inodorous, and 

 soluble in 2,000 parts of water. It is composed largely of 

 digitalin, with a little digi toxin. Dose, — H. & C, gr.j (.015) 

 = gr.22i- of digitalis leaves; D., gr.^V'A (-001-. 002) = 

 gr.lJ-3 of digitalis leaves. 



Neither Nativelle's nor Homolle's digitalin form a com- 

 plete substitute for digitalis, and their use is not recom- 

 mended. Schmiedeberg's digitalin is, however, said to be a 

 reliable substitute, by eminent authority. 



IncompatihUity. — Digitalis is incompatible with tannic 

 acid, lead acetate, cinchona and ferric salts. 



Digitalis Folia Dose. — H., gr.x.-3i. (.6-.4); C, 3 ss.-i.ss. 

 (2.-6.); Sh. <fe Sw., gr.v.-xv. (.3-1.); D., gr.ss.-iii. (.03-.2). 



PREPARATIONS. 



Extractum Digitalis. Extract of Digitalis. (U. S. P.) 

 Made by maceration and percolation with alcohol and water; dis- 

 tillation of the alcohol and evaporation to pilular consistence. 

 Dose.— H. &C., gr.v.-xx. (.3-1.3); D., gr.i-1. (.008-.06). 



Extractum Digitalis Fluidum. Fluid Extract of Digitalis. (U. S. P.) 

 Made by maceration and percolation with alcohol and water, and 



evaporation, so that 1 Cc. = 1 Gm. of the crude drug. 



Dose.— H., mx.- 3 i. (.6-4.); C, 3 ss.-i.ss. (2.-6.); Sh. & Sw., nv.-xv. 



(.3-1.); D., mss.-iii. (.03-.2). 



Tinctura Digitalis. Tincture of Digitalis. (U. S. & B. P.) 

 Made by maceration and percolation of powdered digitalis (150), 



with sufficicient alcohol and water to make 1,000. (U. S. P.) 



Dose.— H. & C, 3ii.-vi, (8.-24.); Sh. &Sw., rnxxx.- 3 i.ss. (2.-6.); 



D., mv.-xxx. (3-2.). 



Infusum Digitalis. Infusion of Digitalis. (U. S. & B. P.) 

 Digitalis, 15; alcohol, 100; cinnamon water, 150; boiling water, 

 500; cold water to make 1,000. By maceration. (U. S. P.) 



