

RELATION OF THE DISEASE TO FUNGI. 55 



(216.) Manures, from their stimulating character, have 

 doubtless an influence on the disease ; and, as far as I can 

 learn, those plants are freest from disease which grow on 

 soil which has been left quite unmanured. The only 

 manner, however, in which manures do injury, is by caus- 

 ing the plant to assume a very succulent and cellular 

 character. 



CHAPTER IX. 



RELATION OF DISEASE TO FUNGI. 



Berkeley's opinion (217). Fungi common to decaying matter 

 (219). Fungi on decaying tubers (221). Botrytis infestans (223). 

 Fungus in the inside of tubers (226). Different fungi growing 

 in rotten tubers (227230 ) Black fungus, on stem (231). 

 Other species of fungi (232, 233) Singular appearance of motion 

 in fungi (234). Fungi influence the disease (237). Fungi fulfil 

 important functions in nature (238 240). Gangrena sicca and 

 humida (241). Tubers infected with fungi perhaps injurious as 

 food (241). 



(217.) MR. BERKELEY states, that " to his own apprehen- 

 sion it appears clear that the cause of the premature decay 

 and putrefaction of the haulm is to be found in the parasi- 

 tic fungus, in consequence of whose attacks the tubers are 

 unripe, and in a bad state for preservation." 



(218.) His article upon this subject is well worth perus- 

 ing, and the figures with which it is illustrated are ex- 



