4 MATERIA MEDICA. 



and generally requires to be diluted vvitii 

 water before it is used ; but wben it is want- 

 ed todestroyexcrescences, particularly those 

 which arise in canker of the foot, it may be 

 used alone with advantage. One ounce of 

 the add to a pint of water, forms an useful 

 lotion for obstinate cases oi grease; if made 

 a little stronger it is a good application for 

 foul ulcers. ritriolic acid is sometimes 

 mixed with oil of turpentine and hug's lard, 

 as a detergent ointment for ulcerated heels, 

 or for dispersing indurated tumours ; and 

 when mixed with a proper proportion of spa^ 

 nish flics, it forms an active blister. (See 

 Blisters and Detergents.) 



It is probable that vitriolic acid might be 

 given internally as a tonic, with good effect; 

 ^ut fortius purpose it requires so much ddu- 

 tion, that it could not be given to a horse, 

 in sufficient quantity, without great incon- 

 venience. 



This acid, by combining with other sub- 

 stances, forms many useful compositions. 

 With the mineral alkali, or soda, it forms 

 dauber's salt ; with iron, green vitriol; with 

 copper, blue vitriol. 

 Nitrous Acid, or Strong Spirit of Nitre, 



