90 PLANT DISEASE 



is clear that we should try to give all animal 

 life a bright red blood, and the only true way 

 of doing this is to be sure that the food is 

 such as will produce the blood required, and 

 this I have tried to make clear in previous 

 chapters. 



It may be asked why this disease should 

 not be treated by hypodermic injections of 

 iron and nitrogen. I have no doubt that in 

 heart-water, and no less in redwater, 

 and rinderpest, an injection of dialyzed iron 

 would be beneficial, but there are diffi- 

 culties in the way of doing it on a large scale, 

 owing to the discharge of pus which leaves an 

 open wound, which would be immediately 

 attacked by the ordinary fly, and to keep these 

 wounds healthy while healing, when it comes 

 to a question of a large herd, is outside the 

 region of practical stock farming. 



I have not tried an injection of either nitrate 

 of soda, or potash, but I have no doubt it would 

 have the same objection, namely, an open 

 wound. 



With regard to sheep, an injection of iron is 

 distinctly beneficial, and no doubt does check 

 heartwater, especially in combination with 



