202 TETERIXARY MATERIA MEDICA. 



in a mixture of alcohol 3 with ether 1, but insoluble 

 in ether, chloroform, benzol, or fixed oils. Specific 

 gravity not less than 1.250. 



Actions and Uses. — Glycerin is chiefly demul- 

 cent and emollient; in large doses, undiluted, some- 

 what irritant to the local mucous membranes whether 

 given per os or per rectum. It has some antiseptic 

 and antiparasitic properties, but these are only slight. 

 Enemata of fl. 3 ij.-vi. are laxative for the horse; 

 fl. 3 ss.-i. for dogs. It forms the bases for many anti- 

 septic and astringent preparations, and is added to 

 liniments and lotions to prevent these from drying 

 too rapidly. The chief glycerites are : 



Glijcerinum Acidi Carbolici, glycerin of carbolic 

 acid, containing twent}^ per cent, of the acid. 



Glijcerinum Aluminis, glycerin of alum, contains 

 fifteen per cent, of alum. 



Glycerinum Tamiiiii, glycerin of tannin, contains 

 twenty per cent, of tannin. 



Glijcerinum Plumbi, glycerin of lead, contains 

 fifty per cent, of Goulard's extract. 



Glycerinum Amyli, glycerin of starch, contains 

 starch 1, water 3, and glycerin 5. 



The last of these, glycerin of starch, is of the con- 

 sistence of petrolatum, and like the latter is used as 

 an ointment base, being for this purpose cleaner than 

 fatty bases. It can be readily washed off, but the 

 therapeutist must not forget the incompatibility of 

 starch with preparations of iodine. It is also a most 

 excellent excipient in making pills or balls of quinine, 

 etc. 



