506 MATEIIIA MEDICA 



LIVER OF SULPHUR, or SULPHURET OF PO- 

 TASS. — Hepar Sulphuris, vel Sulphuretum Potassas. See 

 Hepar Sulphuris. 



LOGWOOD. — H(^matoxi/li Lignum. An extract made from 

 logwood possesses a considerable astringent power. It is often 

 employed by medical practitioners in diarrhoea depending upon 

 relaxation of the bowels ; and though it has not yet been intro- 

 duced into veterinary practice, it would probably be found an 

 useful medicine in similar complaints of the horse, and deserves 

 a trial in cases which have resisted the common remedies. 



It may be given in doses from two to three drachms. Alum, 

 opium, and some aromatic, such as cassia, and sometimes chalk, 

 are often joined with the extract. See HtEMAToxyli Lignum. 



LUNAR CAUSTIC. See Argenti Nitras. 



LYTT^. See Cantharides. 



MACERATION differs from infusion only in being con- 

 tinued for a longer time, and can only be employed for those 

 substances that do not quickly spoil. 



MADDER. — Ruhia. This is a perennial plant, and a native 

 of the Levant, the South of Europe, and Africa. The root was 

 formerly used in medicine as a remedy for jaundice. Farriers 

 still employ it for the same complaint (which they term the 

 yelloivs) both in horses and horned cattle. 



The dose is about one ounce. 



ISIadder has the singular property of turning the bones red, 

 provided its use be persisted in for some time. 



MAGNESIA. — Magnesia. A white powder, so extremely 

 light, that a sufficient dose could not be given to a horse without 

 inconvenience. It is a very useful absorbent in the human body, 

 and well calculated to remove heartburn, by destroying any 

 acidity that may exist in the stomach; it has also the advantage, 

 in this complaint, of acting as a gentle laxative. In the horse, 

 chalk, or either of the fixed alkalies, answers the purpose equally 

 well : and, if a laxative effect be required, a small dose of aloes 

 may be added. 



Magnesia, Sulphate of. — Magnesia Sulphas. Epsom 

 Salts. See Sulphate of Magnesia. 



MALLOWS, COMMON. — Malva Sylvestris. This is an 

 annual, indigenous plant, and, from the mucilage it contains, is 

 useful in the composition of emollient drinks : fomentations, 

 clysters, and poultices may also be made with it. See Emol- 

 lients, Fomentations, and Clysters. 



MALT is very serviceable to horses that are recovering from 

 fever. It is useful, also, when the system is weakened by large 

 abscesses which discliarge copiously, and in almost every case 

 depending on debility. 



It appears to be easy of digestion, and very nutritious, though 



