142 PLANT DISEASE 



was room for improvement, only he did not 

 know what to give them." 



Mr. John Kemp, of Spanover Cathcart, 

 South Africa, says 



" He has thirty orange trees thirteen years 

 old. When he planted them he placed a large 

 cask at the top end of the row. This cask he 

 used nearly to fill with cow manure, and fill 

 up with water, letting it stand for two days 

 before irrigating the orange trees, when he used 

 to let all the irrigation water flow through 

 the cask, the cask having a larger intake than 

 outlet, so turning the irrigation water into a 

 mild liquid manure, with the result that the 

 trees were always healthy, much to the aston- 

 ishment of neighbours, who had trees infected 

 with scale." 



To prove the trees were thriving, one year 

 two oranges were picked which measured 18" 

 and 1 6" in circumference respectively. 



For the last three years he has refrained 

 from giving the trees this liquid manure, with 

 the result that they have become infested with 

 scale, and it was only two or three weeks 

 before I visited the farm that the trees had been 



