580 THE VETERINARY SCIENCE. 



Its Action and Use. — It is used for burnings off warts, proud 

 flesh in cuts and growths in any part of the body by just wetting 

 the stick and rubbing it to the parts. Keep the sticks corked in 

 a bottle for they dissolve when exposed to the air. 



NITRATE OF POTASH OR SALTPETRE. 



Nitrate of Potash or Saltpetre is got from the mineral king- 

 dom, and is used in the form of a white crystal powder. 



Its Action and Use. — Its chief action is on the kidneys and 

 blood, it causes the kidneys to secrete an extra amount of urine. 

 It is used a great deal in practice in almost all lung troubles, also 

 in cases where the blood is bad and where the sheath and legs are 

 swolen. 



Dose. — For horses, 1 teaspoonful ; cattle, 1 teaspoonful ; 



sheep and pigs, ^ teaspoonful. If given for the kidneys, give 



■once a day ; if for lung troubles, see diseases of the breathing 



organs. 



OLIVE OIL. 



Olive Oil is got from the seeds of an evergreen tree that 

 grows in Southern Europe. 



Its Action and Use. — It is not used internally to any extent, 

 but is used externally for soothing and healing irritated wounds. 

 It may be used in its pure state or be mixed with carbolic acid — 

 10 drops of carbolic acid to 4 ounces of olive oil. 



OIL OF TAR. 



Oil of Tar is a product of the pine tree, and the form it is 

 used in is of a dark, thick, sticky liquid with a tar-like smell. 



Its Action and Use.— It is chiefly used in cases of chronic 

 cough and is a very effectual remedy. Give a teaspoonful three 

 times a day in the horse's feed, or on his tongue with a spoon. 



OXIDE OF ZINC. 



Oxide of Zinc is got Irom the mineral kingdom, and the form 

 we get it in is of a white, fine powder. 



Its Action and Use. — It is mostly used in making up healing 

 salves, and is used in the same proportion as the receipt that is 

 given in chapped or sore teats in cows. 



OIL OF MALE SHIELD FERN. 

 Oil of Male Shield Fern is got from a shrub that usually 

 grows along the side of the road in most temperate countries. It 

 is got in the form of a dark, thick, oily liquid. 



