502 MATERIA MEDICA 



LAXATIVE DRENCH. 



No. 1. Castor oil 1 pint. 



No. 2. Sweet oil, or linseed, or rape oil... 1 pint. 



No. 3. Epsom salt 6 to 12 ozs. 



Whey or gruel 1 quart 



Castor oil 6 to 12 ozs. 



Mix. 



BALL. 



Aloes 3 to 4 drs. 



Soap 3 to 4 drs. 



Syrup, enough to form a ball. 



LEAD. — Pliimhum. Many useful preparations are made 

 from this metal ; among which are the following : — 



Lead, Acetate of, or super-acetate of lead, commonly 

 called sugar of lead, is much used in making cooling lotions and 

 eye-washes Liquid sub-acetate of lead is commonly named 

 Goulard's Extract, and is used for similar purposes. See Gou- 

 lard, Lotions, Collyria or Eye-Washes, and Ointments. 



Lead, Red, or Miniuvi. This is a red powder, made by 

 keeping lead in a high degree of heat ; it is used in the com- 

 position of plasters and charges. 



Lead, White, is commonly made by exposing thin sheets of 

 lead to the vapour of vinegar, by which it is converted into a 

 white powder. White lead is often employed in the composition 

 of healing and softening ointment, for horses that are subject to 

 cracked heels. See Acetate of Lead. 



LIME. — Cah. This earth is rarely found in a pure state, 

 but is easily prepared from any of its carbonates by the action 

 of fire. When mixed with 700 times its weight of water, it is 

 completely dissolved, and forms lime-water, the properties of 

 which are tonic and antacid. Lime-water is recommended in 

 the disease termed diabetes, whicli consists in a profuse dis- 

 charge of limpid urine, causing weakness, emaciation, and 

 hectic fever. 



I have seen it used, however, in two cases without success. 

 Lime-water may be made by mixing lime with a large propor- 

 tion of boiling water, stirring the mixture for some time, and 

 afterwards pouring off the transparent liquor, which is to be 

 carefully excluded from the air. 



Chlorinated Lime. — Calx Ctilorinata. " This term is applied 

 l)y the College of Physicians to the compound of chlorine and 

 lime, long known in the arts by the name of chloride of lime, 

 or bleaching powder. 



"It is a valuable disinfectant. In order to understand its 

 action, it is necessary to bear in mind that the foetid gases given 

 oil' during the decomposition of vegetable and animal substances 

 are mostly compounds of hydrogen with certain bases. When 



