526 DISEASES OF THE BLADDER. j 



Preventive treatment appears 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 I 



drainage of the pasturages, and their improvement by the use of 1 



various manures, particularly superphosphates and lime. These I 



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 hsematuria 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 I 



spontaneous recovery is more frequent under such conditions. ■ 



It is probable that, during attacks of haematuria 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 j 

 an hypothesis. j 



