38 
Growth of Bacilli 
Diagrams 7 and 8 illustrate the same type of division and post- 
fission movement in eight diphtheroid organisms, (A ) B. Hofmanni, (B) 
B. coryzae segmentosus, (C) B. xerosis, (D) a diphtheria-like bacillus 
from the eye of a diseased turkey, (E) a bacillus from a plate exposed 
to the air, (F and G) two different species from the mouth and (H) one 
from the lung of a grouse. 
Diagram 7. Illustrating the development of various diphtheroid organisms 
on the surface of agar. 
Diagram 7, series A, has been selected for illustration because it 
shows the mode of formation of the so-called “pseudo-diphtheria” tj^pe 
of B. Hofmanni (Figs. 4 to 9, No. 11, and Fig. 7, No. 1212). 
In each figure the time which had elapsed from the beginning of 
the observation is indicated. By reference to these figures it will be 
seen that some organisms divide very quickly and others very slowly. 
Similar snapping post-fission movements occur in deep growths, but 
the resulting bacilli remain more nearly in line than they do on surface 
