436 MANUAL OF MODERN FARRIERY 



REMEDIES. Like other germ diseases, once the 

 germs have gained an entrance to the lungs, the 

 diseased conditions or structural changes will progress 

 until the last germ has ceased to exist. We know of 

 no agent which will destroy these germs and not 

 destroy the lung tissue. But we know of a method 

 and an agent whereby cattle whose lungs are sound can 

 be rendered proof to the attacks of the organisms, and 

 that method consists in inoculating the lymph found 

 in the early stages of the disease in the lung of the 

 affected animal into the tail of the sound animal. 



Inoculation of the virus has been looked upon by 

 some as producing a milder form of the disease, and 

 some have gone the length of asserting that it is a 

 curative agent, but in our opinion it is neither the one 

 nor the other. The result of inoculation in our hands 

 has never demonstrated the existence during life of 

 a lung affection, nor has it demonstrated, on post- 

 mortem, diseased lungs, and therefore we hold that 

 it does not produce a milder form of the disease or any 

 form at all. Moreover, an inoculated animal, if its 

 lungs were sound, that is free of the pleuro germs at 

 the time of inoculation, has never been known to give 

 the disease to other cattle. Then as regards the 

 curative power of the inoculated lymph, numerous 

 experiments have satisfied us that it is neither a 

 diagnostic nor curative agent, the symptoms exhibited 

 and the series of changes produced at the point of 

 inoculation, being as pronounced in the affected as the 

 non-affected animal. 



A sound animal successfully inoculated with the 

 lynlph found in the lungs of an affected animal, is 

 beyond all doubt immune to an attack of infectious 

 pleuro-pneumonia by the natural method. 



This disease, as has already been stated, is non- 



