66 



68 



ll J 



•f^ % 



K 







j % 



63 



Figure 66. Variant C. A colony type with an irregular edge and markedly convoluted surface. 

 Primary culture on liver infusion agar. Colonv is isolated. 24 hours old. X 11 diameters. 

 (See Table 4 and page 39.) 



Figure 67. Variant D-l. A colony type with a very irregular outline. Surface prominently 

 convoluted and striated. Primary isolation from necrotic tissue. Liver infusion agar. 24 

 hours old. X40 diameters. (See Table 4 and page 39.) 



Figure 68. Variant E. Colony type isolated from necrotic tissue. Primary isolation on liver 

 infusion agar. Colony with an irregular edge and finely convoluted surface. Four days old. 

 X15 diameters. (See page 39.) 



Figure 69. Strain 11706. Cells in a tissue smear prepared from an abscess in an infected 

 chick which yielded pure cultures of S. pullorum. X 1200 diameters. (See page 39.) 



Figure 70. Strain XIV. Cellular types in a smear prepared from unabsorbed yolk of a chick. 

 Typical cells and short filaments may be seen. X 1200 diameters. (See page 39.) 



