42 
Growth of Bacilli 
central organism. Figs. 4 and 5 (70 and 90 minutes) show the 
continuation of this process. In Fig. 6 (105 minutes) the organism 
to the left is slipping past the central one and in Fig. 7 (120 minutes) 
the condition is more advanced. At this stage the colony consists of 
three parallel lines of bacilli. The further development of this colony 
by the same methods is illustrated in Figs. 8 to 11 (140, 180, 225, 250 
minutes respectively). In the latter figure the colony consists of 109 
distinctly separated rods and two long unsegmented threads which 
become parallel with each other at the right hand extremity of the 
colony. In Fig. 12 (340 minutes) the colony is just beginning to fuse 
with another colony at the bottom right hand corner of the photograph. 
During all this time the bacilli forming the colony remained in one 
plane. 
Diagram 10 illustrates the development of a young colony of B. coli 
from a single cell, and diagram 11, series A and B, the development of 
V. cholerae. Series B, Fig. 13 shows some very long forms. 
A t. a 3 j, 5 - & 7 8 q. 
•tS 11,0 1 5* ,&F /JZ 
Diagram 11. Illustrating the development of V. cholerae on the surface of agar. 
