78 PLANT DISEASE 



yarding the sheep, the result of which is that 

 a large percentage of the potash, to say nothing 

 of other plant foods, has been deposited in heaps 

 sometimes of huge dimensions ; as compared 

 with other countries where the sheep remain 

 at large and their droppings are more or less 

 evenly distributed over the surface of the 

 pasture. 



HEARTWATER 



Heartwater, I believe, is a disease quite un- 

 known in any part of the world but South 

 Africa, but it is interesting as a very insidious 

 form of bacterial disease. 



It is prevalent in the eastern side of Cape 

 Colony the Kei river, I think, is at present 

 the northern limit of the country devastated, 

 extending down the coast some distance be- 

 yond Port Elizabeth, which means over 200 

 miles of coast line and extends inland from 

 forty to fifty miles up to as much as 100 

 miles. 



So, after excluding patches of non-infected 

 country, there must be some 7,000,000 acres 

 of the best pastoral country in South Africa 

 rendered almost useless for carrying angora 



