514 



BACTERIAL DISEASES OF PLANTS 



FIG. 386. Young vigorous shoot of Morus alba showing lenticel proliferations 

 due to closure of the lenticels by Squibb 's petrolatum: (1) and (2). Two treated 

 portions 2 was taken a foot above 1. (Time 13 days; 2d treatment on llth 

 day but not necessary.; Exposure begun March 5, 1918. Cut and photographed, 

 March 18. X 5. (3) Untreated part, above 2. (4) Untreated part, below 1. 



