452 LEVINE: STUDIES ON PLANT CANCERS—I 
Description of plates 17 and 18 
PLATE 17 
Fic. . Young leaf of Bryophyllum calycinum, showing well-developed crown 
galls at ess basal notches, inoculated with Bacterium tumefaciens forty-five days 
previously. 
Fic. 2. Older leaf, control notches showing leafy shoots, none appearing at the 
inoculated notches forty-five days later. The midvein, also inoculated, shows 
ordinary crown gall. 
S. 3, 4. Ventral and dorsal a of a leaf, the basal notches and mid- 
vein 2 which were inoculated with Bac m tumefaciens, showing well-developed 
galls without leafy shoots. The control, velo notches show normal leafy shoo 
Fic. 6. Young leaf, in which the inoculations were made near the apical notches, 
showing a dwarfed leafy shoot with a crown gall attached to it. One of the control 
notches shows a well developed leafy shoot. 
Fic. 10. Young plants. In a, b, c, e, and f, the growing regions were inocu- 
lated; in d, there was no inoculation 
PLATE 18 
1G. 5. Old leaf, inoculated at the basal notches 140 days previously, showing 
a large crown gall. The control notches show normally developed plants coming 
from them. 

Fic. 7. Old leaf, 140 days after inoculations d the notches, showing 
dwarfed leafy shoots eae in contact with crown galls. “The control notches have 
a normal plan 
Fic. 8. Old leaf roe to mother plant, showing a large gall on the midvein 
spot . inoculating it with Bacterium tumefaciens five months previously. 
IG. 9. Same leaf now detached, nine months after inoculation. 

