Bui. 213, Bureau of Plant Industry, U, S Dept. of Agriculture. 



Plate XXXIII. 



Crown-galls on Brassica due to inoculation: (B) Cabbage. (C) Collard. (A) Enlarged 

 view of C, showing clusters of roots (hairy-root) growing out of the lower half of the gall ; 

 year, 1910; time from needle pricks to photograph: 3 months. (D) Hairy-root of apple 

 on quince. Time: 19 months. 



