290 INOR(iANIO AGENTS 



undilatable os, to assist the operator in remedying faulty 

 positions of the foetus by relaxation of the parts, and to 

 facilitate instrumental delivery in bitches. Anaesthesia is 

 also indicated in removal of tumors, in arytenectomy, 

 excision of the eyeball or parts of the hoof, extraction of 

 teeth, reduction of dislocations, setting of fractures, and to 

 relieve severe pain in colic, and to overcome spasm in 

 chorea, or convulsions due to poison or natural causes. 



Chloroform is used to destroy sick, injured or aged 

 horses, but is not so rapid, convenient, or effective as the 

 44 calibre revolver, or rifle. The bullet should be directed 

 toward a point upon 'he forehead at the intersection of two 

 imaginary lines drawn from either eye up to the root of the 

 opposite ear. 



Class 3.— Nitrites. 



« 



Spiritus ^theris Nitrosi. spirit of Nitrous Ether. 

 (U.S.&B.P.) 



Synonym. — Sweet spirit of nitre, spiritus nitri dulcis, 

 spiritus nitrico - sethereus, E. ; ether azoteux alcoolise, 

 liqueur anodine nitre use, Fr.; versiisster sallpetergeist, G. 



An alcoholic solution of ethyl nitrite (C2H5NO2), yield- 

 ing, when freshly prepared, not less than 11 times its own 

 volume of nitrogen dioxide (NO). 



Derivation. — Dissolve sodium nitrate, 770, in water; 

 add deodorized alcohol, 550 ; introduce sulphuric acid, 520, 

 previously diluted with water ; distil in flask and condense. 

 Wash distillate with ice water to remove alcohol, with cold 

 solution of sodium carbonate to remove traces of acid ; 

 agitate with potassium carbonate to remove traces of water ; 

 filter, and add sufficient deodorized alcohol to make the 

 mixture weigh 22 times the weight of the nitrous ether to 

 which it was added. 



Properties. — A clear, mobile, volatile, inflammable 

 liquid, of a pale-yellowish or faintly greenish-yellow tint. 



