REPORT OF THE SOCIETY 



107 



On oat ineal and potato agar the rapidity and the mode of growth of the 

 mycelium are the same. The mycehiirn ordinarily grows on the surface of 

 the agar, but in few exception it is slightly upright. In every case there is a 

 large number of small sclerotia (Fig. 3 and 4) although on the carrot the sclerotia 

 are large. 



Inoculation 



Potato plants and one of tomato were inoculated on the stem a little above 

 the surface of the soil with mycelium obtained by growing sclerotia, from the 

 interior of a potato stem, on a piece of sterile carrot. 



Fig. 2. 



-Sclerotial disease of pcAalo. Solid sclerotial growth on 

 surface of carrct. 



The infection c>n the tomato stem was more rajjid than that on the potato 

 stems. On the tomato the mycelium grew and the cortical tissues were 

 destroyed 2 inches above soil level and the plant wilted. Fig. 5. (A indicates 

 upper limit of cortical tissue destroyed.) 



At present one of the inoculated potato stems has tissues for ^i of an 

 inch in height and half of the circumference of the stem destroyed, on another, 



