miscellaneous: stimuli underlying tumor-formation 527 



Fig. 396. — From the same series as Fig. 395. A pared, sterile block of Early 

 Rose potato showing development of small tumors from the cut surface. Most are 

 broad based but X was narrowly pedicelled. Those at the top and the lower 

 left are from the region of the cambium; A' and Y are from deeper tissues. 

 Photographed June 14, 1919. X 5. 



