ARNICA. 601 



Arnica. 



Internally, it is a useful stimulant. It appears to have a special 

 action in increasing the circulation of blood in the surface of 

 the body. Dose of the tinctu_re, 1 to 2 oz. in a pint of water. 



Arsenic 



is an alterative and tonic. Its good effects, when given 

 internally, are well marked in skin diseases and in surra. As 

 a rule, it should not be given continuously for more than ten 

 days at a time ; as it accumulates in the system, and may tend 

 to cause corrosion of the coats of the stomach and intestines. 

 Externally, it is used as a caustic. 



For treatment of arsenical poisoning, see p. 578. 



Dose, usually 5 grains; in surra, up to 20 grains. 

 Arsenic is most conveniently given in the form of liquor arseni- 

 calis, which contains 4 grains to the ounce. 



Atropine 



is the active principle of belladonna. One-third to 1 grain of the 

 sulphate of atropine, dissolved in water, may be injected sub- 

 cutaneously (p. 633). The liquor atroinnce sulphatis which is sold 

 by chemists, contains one grain of atropine sulphate in 100 

 minims. 



Beer. 



See " Ale." 



Belladonna. 



See pp. 340 and 433. Externally, a mixture composed of extract 

 of belladonna and glycerine — of the consistency of thick cream — is 

 a useful application for recent sprains. 



Blisters. 



See " Cantharides " and " Mercury, Biniodide of." 



Boric Acid {Boracic add). 



See p. 68. Antiseptic cotton-wool is made by steeping 

 cotton-wool in boiling water which has as much boric acid in 

 it as it will dissolve; then taking out the cotton-wool and 

 drying it. 



