Bui. 1120, U. S. Dept. of Agriculture. 



Plate V. 



Plants from Canker Nursery G. 



A , heat-cankered plants on the left; those on the right are not cankered. All four plants are of the 

 same age. B, cankered plants as in A . C, the same plants as in B, enlarged to show the detail 

 of the constricted areas and the enlargements just above these areas. Adventitious roots are 

 starting at the soil line, on account of contact with moist soil. This does not occur when the soil 

 is drj'. 



