Cholera Suis, Hog Cholera, etc. 43 



Disinfection. The experiments of the Bureau of Animal In- 

 dustry show that, apart from freezing, four months in the soil, 

 serves to render the bacillus harmless. 



From .75 to 1 per cent of quick lime added to soil in the form 

 of lime water, destroyed the virulence in n days. 



Lime can be employed as a thick whitewash on pens, fences, 

 yards, etc., the precaution being taken to see that it is newly 

 burned, caustic and applied in sufficient amount. Lime that has 

 been kept absorbs carbon dioxide and loses its disinfectant prop- 

 erty. If % lb freshly made chloride of lime is added to each gal- 

 lon of the caustic lime white wash the certainty of success is 

 insured. Lime water has the advantage of being applicable to 

 grassy surfaces, without proving hurtful to the vegetation. For 

 buildings and yards it furnishes a ready means of estimating the 

 thoroughness of the application. 



Sulphuric acid (1:100 or i}( oz. to 1 gallon) makes a good dis- 

 infectant for buildings and yards. Like lime this can be used 

 freely without fear of poisoning the animals. 



Carbolic Acid, 5 per cent, can be used with great safety. The 

 Bureau of Animal Industry advises the combination of this with 

 sulphuric acid, which adds greatly to its solubility. 



Formalin may be employed, diluted one to forty of the solution 

 (1 per cent of the gas) in buildings and on woodwork generally. 

 It may also be applied in the form of gas by heating the solution 

 in closed rooms. Like carbolic acid it is especially applicable to 

 cars, boats, and other vehicles. 



Corrosive Szcblimate (1:500) makes a convenient and cheap 

 disinfectant, with the drawback that it is poisonous, and destruc- 

 tive to metals. Mercuric Iodide though more potent is also more 

 expensive. Blue stone (2:100) and zinc chloride (10:100) are 

 also effective but poisonous. 



The failure to stamp out hog cholera in England and America 

 has been largely chargeable on the appointment of laymen to do 

 the work of the expert, and no less so on the attempt to deal with 

 the disease in hogs in transit or in the market rather than in the 

 farm where they have been raised or kept. Let the fat and stock 

 markets be kept rigidly apart, together with the means of convey- 

 ance to and from these, and let no stock swine start for a market 

 or destination without a certificate of the soundness of the locality 



