BY K. GREIG SMITH. 131 



bacterial j^roduct; and (3) the chief active organism is Bad. 

 acacice. 



IX. — The Gum-flux of an unknown Stock of the Japanp:se 



Date-plum. 



A twig"^ of a seedling tree used as a stock for the Japanese 

 date-plum, and apparently a species of Diospyros, showed small 

 tears of an amber-coloured gum exuding from wounds upon tlie 

 surface. 



Two gum-producing bacteria were isolated by means of plate 

 culture from the woody tissue. One of these was Bac. levani- 

 formmis^ the other was Bad. acacice, which was undoubtedly 

 responsible for the production of the exudation. 



* The specimen was sent by Mr. H. W. Potts, Principal of the Hawkes- 

 bury Agricultural College. 



