74 SYNOPSIS OF VETERINARY 



Dose. — Horse, 2 to 6 drs., l / 2 oz. three times a day is the 

 average dose. 



LIQUOR ARSBNI BT HYDRARGYRI IODIDI, known 

 as Donovan's Solution.— 1 oz. contains about 4^2 grs. (4.56) each 

 of iodide of arsenic, and red mercuric iodide. It is an alterative 

 in skin diseases, and should be kept in a dark place, and not used 

 if decomposed ; that is if color is changed to a yellowish red and 

 the odor of iodine is apparent. 



Dose. — Horse, 2 drs. to 1 oz. ; pigs, 15 to 45 Ms.; dogs, 2 to 

 10 Ms. — y 2 oz., is the average dose for a horse given 3 times 

 daily. 



LIQUOR POTASS 1 1 ARSENITIS— Fowler's Solution.— 

 This is the preparation most commonly used. A solution of 

 potassium arsenite, contains arsenous acid 1 part, potassium bi- 

 carbonate 2 parts, compound spirits of lavender 3 parts and dis- 

 tilled water 94 parts. 



Dose. — Horse, 2 drs. to 1 oz. ; cattle, y 2 to iy 2 ozs. ; sheep 

 and pigs, 10 to 45 Ms. ; dogs, 2 to 10 Ms. Average dose for 

 horse y 2 oz. usually given 3 times daily in drinking water or 

 bran mash. 



LIQUOR SODII ARSENATIS.—A solution ot arsenate 

 of soda, known as Pearson's Solution, the same strength as 

 Fowler's Solution, 4.56 grs. to the oz., but it is less active. 

 Dose about double that of Fowler's Solution. It is better to ad- 

 minister arsenic in solution than to give the solid arsenous acid, 

 and Fowler's Solution is the best ; Donovan's Solution may 

 prove efficacious in chronic skin troubles, where other prepara- 

 tions will not benefit, also in nasal catarrh. Give small doses 

 at first and then increase, unless very small doses are taken 

 for its action on the stomach, to increase appetite and digestion 

 by virtue of its irritant properties. Arsenic should be admin- 

 istered with or after meals and well diluted in water or bran 

 mash. 



Antagonists and Incompatibles.—The salts of iron, magnesia, 

 lime, and astringents, are chemically incompatible. The hy- 

 drated oxide of iron, or as it is also known, hydrated sesquiox- 

 ide of iron, freshly made and in soft magma is the antidote to 

 arsenic. (See Iron.) Give dogs from y 2 to 1 tablespoonful 



