Bui. 213, Bureau o' Plant l-duo*'y, U. S Dept of Agriculture. 



Plate XXXV. 



(1) Gall on Salix babylonica inducect by needle prick introducing pure subculture of Bac- 



terium tumefaciens plated from a South African willow gall. Enlarged. 



(2) Galled quince stem from Dr. Trabut in Algeria for comparison with Plate XXXI 1 1, fig. D. 



