G-. S. Graham-Smith 
33 
of B. anthracis. These colonies consist of twisted strands of parallel 
bacilli occasionally surrounded by fringes of irregular loops (Plate V, 
Fig. 10). The central portion of the colony has been well described as 
looking under a low power lens like a mass of cracked ice. 
The peculiar folding which is so noticeable during the early develop¬ 
ment of the colony is probably made possible by the length and 
flexibility of the parts of the capsule connecting the individual bacilli 
composing the chain. The length of this connecting portion of the 
Diagram 4. Illustrating the development of B. pestis on the surface of agar. 
Parasitology in 3 
