INVESTIGATIONS AT THE COLLEGE 69 



alterations in the mineral constituents of the currant 

 were produced by muriate of potash. 



In the same article he gave a brief summary of 

 his experience with the use of muriate of potash on 

 peach trees suffering from 'yellows.' He believed this 

 trouble to be due to an abnormal condition of the sap 

 in so far as its mineral constituents were concerned, 

 which resulted in the development of a fungous growth. 

 He found that the cells in the young branches of the 

 diseased trees contained an abnormally large amount 

 of phosphoric acid and lime; the application to the soil 

 of two to three pounds of muriate of potash per tree 

 for two or three seasons reduced the percentages of 

 these elements, and this reduction, together with judi- 

 cious pruning, restored the tree to a vigorous growth. 



The details of this experiment are given in the Sec- 

 ond Report of the State Agricultural Experiment 

 Station, 1 p. 105. The cause of peach yellows still re- 

 mains a mystery, according to William H. Taylor, 

 chief of the Bureau of Plant Industry, United States 

 Department of Agriculture. 



J. B. L. 



1 In co-operation with David P. Pcnlmllow. 



