116 MATERIA MEDICA.- 



LAC. A resin of a dark colour, depositOGl 

 by an insect of llie East Indies on the small 

 branches ot trees. It is uow cmpioved only 

 in the composition of sealing wax and 

 varnislies. 



LADANUM. A resinous substance 

 brought from Candia. It has been recom- 

 mended as a pectoral medicine, but pro- 

 bably does not possess any quality of that 

 kind, as it is now used only as an ingredient 

 in a warm stimulating plaster, wtjich is of no 

 use in veterinary practice. 



LAUDANUM. A popular term for 

 tincture of opium. (See Opium J 



LAVENDER. A plant whose distilled 

 water and fragrant oil are employed in medi- 

 cine, but not in the veterinary practice. 



LAUREL, or ^ay. The leaves of bay are 

 used only \w fomentations. (See Pharm.J 



LEAD. Many useful preparations are 

 made from this metal, among which are 

 litharge, Goulard's extract, sugar of lead, 

 and the following. 



LEAD, RED, or Minium. This is a rod 

 powder, made by keeping lead in a high de- 

 cree of heat : it is usod in tlije composition- 

 of plasters. 



