6 THE FARM DOCTOR. 



The following are especially applicable to solids and liquids : 



Chloride of lime sprinkled on floors, yards, dung-heaps, etc., 

 or applied to walls, wood-work, etc., or poured into drains, as 

 a solution of |lb. to a gallon of water. 



Chloride of zinc is equally efficient but more expensive, and 

 chloride of aluminium {chloralum) is somewhat less potent. 



Sulphate of iron {copperas) is one of the most efficient and 

 cheapest disinfectants for drains, manure, floors, yards, etc., 

 and may be applied either in fine powder or in solution. 



The sulphates of copper and zinc and perchloride of iron are 

 efficient but much more expensive. 



Saturated solutions of caustic potassa and soda are satisfactory 

 for wood-work, harness, and utensils, but they are useless if 

 diluted. Lime is useful in graves by absorbing the water and 

 uniting with the organic debris, but is very unsatisfactory as a 

 genera] disinfectant. 



Permanganate of potassa promptly changes putrefying organic 

 matter, rendering it sweet and wholesome, but it is question- 

 able how far it can destroy living organic germs of which many 

 of the contagious principles are probably composed. The 

 same remarks apply to charcoal, animal and vegetable, and 

 to earth, especially that containing a considerable proportion 

 of clay and marl. 



HORSE-POX. 



This is probably identical with cow-pox, being indistinguish- 

 able when inoculated on men or cattle. It most frequently 

 attacks the limbs, but may aff"ect the face or other parts of the 

 body. There is usually some little fever, which, however, passes 

 unnoticed by the owner. Then swelling, heat, and tenderness 

 supervene commonly in a heel, and firm nodules form, increas- 

 ing to one-third or one-half an inch in diameter, the hair 

 bristles up, and the skin reddens unless previously coloured. 

 On the ninth to the twelfth day, a limpid fluid oozes from the 



