ARSENI TRIOXIDUM — ARSENIC 391 



times the average dose, arsenic is very serviceable as a vermicide for 

 round worms in horses. After daily administration of large doses 

 for 6 to 8 days it should be followed by a purgative dose of linseed 

 oil, to which two ounces of oil of turpentine have been added. 



5. Skin diseases. Arsenic is useful in chronic non-parasitic 

 skin diseases, but is contraindicated in the acute. Quitman recom- 

 mended " Fowler's Solution," internally and locally, for warts in the 

 mouth and upon the muzzle of horses and dogs. 



6. Tonic and alterative. Small doses of arsenic are recom- 

 mended in any case of debility. 



7. Heaves. Arsenical preparations are useful in heaves of 

 horses, but animals require rather large doses. It will relieve the 

 symptoms but will not cure the disease. 



Administration. The trioxide is usually combined with iron 

 and strychnine or nux vomica, and administered as a pill or in 

 solution to small animals, or as a solution or powder to the large 

 ones. 



It is a common practice to use the liquid preparations of arsenic 

 in ascending doses until saturation is shown; that is, to start with 

 small doses and increase each day until saturation occurs, as is shown 

 by swelling and itching of the eyelids. Fowler's Solution (Liquor 

 Potassii Arsenitis) is most useful, but it is incompatible with solu- 

 tions of strychnine or other alkaloids or acids and consequently the 

 acid preparation of the same strength (Liquor Acidi Arsenosi) 

 should be used in such cases. 



The following prescriptions illustrate the uses of arsenic: 



Anemia — Horse. 



R Arseni Trioxidi gr. ij-iij 



Ferri Sulphatis Exsiccati. 



Potassii Nitratis aa. 3 j 



Nucis Vomicse 3 ss 



M. Ft. Pulver. 



Sig. One powder two or three times daily in feed. 



Arsenic Paste. 



B Arseni Trioxidi. 



Acacise aa. 3 ij 



Solutionis Oocainse 4 per cent. q. s. 

 M. Ft. Pasts. 

 Sig. Apply to wart, or small tumor. 



Worms — Horse. 



B Ferri Sulphatis Exsiccati 3 j-ij 



Nucis Vomicae 3 ss 



Nucis Arecse 3 ij 



Arseni Trioxidi gr. x 



M. Ft. Pulver. 



Sig. One in morning, for 8-10 days. Follow with a purge. 



