JONES' SOFT ROT OF CARROT, ETC.: TYPE 229 



ket. Time of year, absence of turgor, varieties used, or gradual 

 loss of virulence on the part of the organism might make a differ- 

 ence with potato tubers. Or it may be that what is here de- 

 scribed as Bacillus carotovorus is a composite of two or more 

 species. His conclusion at that time was that it did not attack 

 the potato. 



According to my observations the organism does not lose 

 virulence readily, and the culture I have (which came originally 



Fig. 170. — Greeti cucumber inoculated by longitudinal stabs introducing 

 Bacillus carotovorus from gelatin colonies. Sliced and photographed January 

 20, 1915, i.e., after 6 days at 23°C. Interior soft rotted. Sliced (check) cucumber 

 from the same lot on the right side, entirely sound. }2 nat. size. 



from Jones, but has been transferred many times in my labora- 

 tory) rots raw potato tubers readily (Fig. 168) and also attacks 

 the soft green stems of this plant (Fig. 169). Its disintegrating 

 action on many tissues other than those of the carrot, e.g., 

 green cucumber fruits (Fig. 170), is very rapid. I have also 

 obtained with it a calla lily rot resembling Townsend's rot 

 (Figs. 171 to 173) and a rot of young leaves of carrot. 



