1?Y R. GHEIG SMITH. 47 



betif, wJiicli possibly causes gummosis of the sugar beet, with so 

 little detail, that it cannot be compared. The same remark 

 applies to Bad. mori, said by Boyer and Lambert to produce a 

 disease (gummosis ?) of the mulberry. Of the other bacteria not 

 associated with diseases of plants, there appear to be none 

 described which have the general characters of this bacterium, and 

 although Cobb's description is meagre, there is no doubt that he 

 intended the name of Bac. vascularutyi for this organism, which 

 he found constantly associated with the gum of affected plants. 



DESCRIPTION OF PLATES. 



Plate iv. 



Fig. 1. Margin of an impression taken from the gum exuded from the cut 

 vascular bundle, stained with fuchsin, and partly decolorised with alcohol 

 (X 1000). 



Fig. 2. Film from growth on cane-gelatine, stained with violet ( x 1000). 



Fig. 3. Film of growth on nutrient agar, stained by the night- blue method 

 for fiagella ( x 1000). 



Fig. 4. Colony on glucose-gelatine ( x 80). 



Fig. 5. Characteristic " tear-drop " growth on cane gelatine ( x J). 



Plate V. 



Fig. 1. Section of sugar-cane affected with gummosis, showing bacteria in 

 large vessel, stained with dilute carbol-fuchsin ( x 500). 



Fig. 2. Another section showing bacteria at the margin of the contracted 

 slime in large vessel ( x 750). 



