526 DISEASES OF THE BLADDER. 



Preventive treatment ajjpears more hopeful, although even in this 

 connection, the best informed appear to have considerable doubts. 

 All those who have studied the question agree in recommending 

 drainage of the pasturages, and their improvement by the use of 

 various manures, particularly superphosphates and lime. These 

 improvements alter the character of the pasture, render the soil 

 healthier, and may perhaps prove sufficient to diminish or prevent 

 the local growth of the germs. Under such conditions, Boudeaud 

 declares that he has seen hematuria disappear from farms where it 

 had previously been in permanent possession. It has also been re- 

 commended that the affected cattle should be sent elsewhere to 

 places where the disease does not exist, and experience shows that 

 spontaneous recovery is more frequent under such conditions. 



It is probable that, during attacks of heematuria in a contami- 

 nated country, successive parasitic infestations occur, which would ex- 

 plain the persistence with which blood is passed, a symptom which does 

 not occur in a healthy country. This view, however, is still only 

 an hypothesis. 



