506 Report of the Mycologist of the 



(2) Will plants from the diseased tubers' be as vigorous aud 

 produce as large a crop as plants from healthy tubers? 



In order to settle these questions I proposed to Mr. McCarthy 

 1o make an experiment. But before Mr. McCarthy received my 

 letter he had already planted or disposed of his whole crop. He 

 had, however, begun an experiment of his own planning, which 

 is by his permission reported below. The experiment was 

 planned and carried out wholly by Mr. McCarthy. 



