2IO SYNOPSIS OF VETERINARY 



externally, it is used to allay irritation of itching skin diseases 

 in the larger animals. 



IJ Ac. Hydrocyanici dil., 3 i. 



Liq. potassae, 3 ss. to i. 



Aq., qs. ad., Oj. 



M. Sig. — Apply to itching surface. 



Internally, on the alimentary tract, it is quickly absorbed by 

 the mucous membrane, and has the same effect on the mouth, 

 stomach and intestines as on the skin, consequently it is useful to 

 allay vomiting of dogs, as : 



IJ Ac. Hydrocyan, dil., m. ii. to iii. 



Bismuthi subnit, 3 ss. to i. 



Aq. cinnamomi, 3 vi. 



M. Sig. — One drachm every two hours as long as necessary. 



Also very useful in cough mixtures. 



A useful cough mixture for horses is as follows : 



Syr. Simplicis qs. ad., 3 xxiv. 

 M. Sig. — Two ounces every 3 or 4 hours. 



For destroying the strongylus micrurus of calves, Prof. 

 Williams gives 10 to 20 ms. of the acid conjoined with sodium 

 carbonate and gentian. 



Action on the Heart. — Large doses instantly arrest its di- 

 astolic action ; it acts direct on the heart and on the center in the 

 medulla ; respiration and the spinal cord are also paralyzed by it, 

 and it dilates the pupil 



Post-Mortem. — Leaves no characteristic lesions, but you may 

 detect the odor of prussic acid. 



It is also useful in tetanus, and is occasionally used to kill 

 the round worms of horses. 



In obstinate diarrhcea it often proves of great service, see 

 prescription under opium. 



Potassium Cyanide has the same actions as prussic acid, but 

 locally causes inflammation of the skin, and applied to broken 

 surfaces may cause death by absorption. 



Summary. — Prussic acid paralyzes all nerve structure in 

 which it comes in contact ; it is then an anodyne, antispasmodic, 



