ENEMIES OF THE SUGAR BEET. 



285 



around this rudimentary root ; the spongiole itself be- 

 ing entirely free. 



The fig. 76 represents the radicle when attacked by 

 the disease. As shown, the spongiole has greatly in- 



Fig. 75. 



Fig. 76. 



%.. 



Radicle in a healthy condi- 

 tion. Above the spongiole ex- 

 ists a hairy growth. 



Spongiole attacked, showing its hairy 

 growth. 



creased in size, and has now a considerable number of 

 hairs on its outer surface. The fig. 77 represents a 

 radicle where the malady has penetrated through the 

 same, causing a total loss of the spongiole. 



Mr. Payen contends that if the organic substances 

 contained in the diseased spongiole be placed in a weak 

 solution of iodine, this latter will become a brownish 

 orange yellow, similar to the organic substance fre- 



