356 
Transactions of the Royal Society of South Africa. 
Strains of 
Type 
Table XXVIII (continued). 
Type 
106 ... . 
103. Developed lactose-fei 
menting mutant 
102. Developed lactose-fer 
menting mutant 
105. Lactose - fermenting 
mutant . 
102. Lactose - fermentin 
mutant . 
103. Lactose - fermenting 
mutant 
Sub-group C. 
1 
Type 
Su 
■group D. 
1 
2 
3 
4 
0-16 c.c. 
0-22 c.c. 
0-32 c.c. 
0-42 c.c. 
• + + + + 
• + + + + 
+ + + + 
+ + + + 
. + + + + 
• 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
. + + + + 
+ + + + 
+ + + + 
. + + + + 
H- + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
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+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
+ + + + 
. + + + + 
+ + + + 
+ + + + 
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. + + + + 
+ + + + 
+ + + 
+ + + 
+ + 
. + + + + 
+ 
+ 
The strains of sub-group B showed some variation in their resistance to 
brilliant green, as might have been expected from the biological differences 
elicited by the serological tests. 
Those belonging to the series 1-11 (fermenting lactose in primary 
culture) all showed a higher degree of resistance to the dye than the A types, 
and equal to or slightly greater than that of B. typhosus. Those types 
which developed lactose-fermenting mutants exhibited a high degree of 
resistance, i. e. much greater than that of series 1-11 or B. typhosus, while 
the paracolon types were apparently less resistant even than the A types. 
In the B sub-group, therefore, the various types could be classified into 
three categories according to their resistance to brilliant-green correlated with 
certain cultural characters and reactions. 
