h]. M. DolDGE 81 



X. {(t) Section tliruugh iiaartjc rind at an oaily stage of infection allowing the 



bacillus in snb-stoniatal cavity and adjoining intercellular spaces. The size 

 of the bacilli is not indicated. Zeiss ,,h mna., comp. ocular No. 0*. 



(/>) Section through' lemon rind, bacillus has multiplied and distended inter- 

 ceLlulai- spaces : same magnification as (a)*. 



(c) Section through tissues of infected orange rind, showing cells completely dis- 

 integrated and occupied by masses of bacteria. Magnification as above*. 



XI. {(i) Stab cultures in nutrient gelatine after 11 days at 20° C, and 2 days at room 



temperature (about 25° C). (b), (r) and {d) colonies on nutrient agar at 

 25° C. (6) and (c) 3 days old, (d) 5 days old. Shows the effect of crowding 

 on the size of the colonies — somewhat reduced, diameter of petri dish, '.]}, 

 inches. 



XI I. ('/) Development of organism on agar hanging block: for full explanation see 



text (Zeiss i\ oil immersion, comp. oc. No. 12. This magnification used for 

 all drawings in Plates XII and XIII unless otherwise stated)*. 



{b) 24 hour colony on hanging block (comp. oc. No. 6). 



(c) Rods showing flagella stained bj'' Ellis' modification of Loeffler's method. 

 18 hours at 25° C. 



XIII. (a) Chains from pellicle on laevulose broth, 16 days at 25° C. 

 (b) Aberrant forms on potato cyUnders, 12 days at 35° C. 



(r) Capsuled rods from edge of impression preparation of colonies on nutrient 



agar, 18 hours at 25° C, stained with fuchsin. 

 ((/) Rods in slime oozing from fruit, stained by MacConkey's method, 

 (e) Involution forms from broth containing 7-5 per cent. NaCl, -18 hoyrs at 

 25° C, stained with aniline gentian violet. 



* Exigencies of space have necessitated the reduction of the following figures : 

 PI. X (a) by h: (b) by i: (c) by f 

 PI. XII (c) by i. 

 PI. XIII (a) by ^: (c) by i. [Ed.] 



