PLANT BACTERIA, VOL. 2. 



PLATE 7. 



Crown Gall on Daisy. 



Two tumors on the stem of a Paris daisy as the result of an inoculation of Baa. tumcfacitns by needle-pricks, and on a 

 branch above the upper one a secondary tumor on the petiole of a leaf. Age of primary tumors about three months ; 

 that on the leaf is much younger, perhaps four weeks old. 



