niiVPACEOUS FEVITS 



131 



Fig. 5S. — Peach crown gall. After Hedgcock. 



apple ^ can be produced by inoculation with Pseudomonas 

 tumefaciens, also that the organisms of the peach, apple, 

 hop, rose, and chestnut galls a^e interchangeable. It is 



1 Hedgcock, G. G., Sci. u. =. S5, 671, April, 1907, and Sci. n. s. S9, 273. 



