SYSTEMATIC DESCRIPTION OF SPECIES. 89 



long forms may be found up to 45/1 in length. It has a 

 dark central rod of staining material, and a faint sur- 

 rounding periplast. It often exhibits dark or refrin- 

 gent granules in its body. Multiplication is probably 

 by transverse division (Fig. 67), but forked forms are 

 found. Rolled up specimens are seen within leucocytes, 

 but these are considered by Levaditi and 

 Mancunian to be degenerative, and not 

 resting forms. The cilia described as 

 present on these spirochaetes by some 

 writers are probably artifacts (Mayer). 

 Koch states that Sp. duttoni shows no 

 chromatin granules, but Mayer describes 

 a differentiation of nuclear matter and 

 protoplasm (see Fig. 24). The latter 

 writer found in an infected mouse, forms 

 resembling B. fusiformis, which may be 

 stages in the development of the organ- FlG 6 _ Sp i ro . 

 ism. These may be compared with chaeta duttoni. 



^1 1 T^ j. 1 j o- j (Schellack.) 



those seen by Krzystalowicz and Sied- 



lecki in cases of syphilis (possibly stages of Sp. pallidd) . 



L. A. and R. S. Williams state that they cultivated 

 Sp. duttoni in defibrinated blood at room temperature, 

 but it is doubtful whether true cultivation was effected. 

 Duval and Todd devised a special medium for this pur- 

 pose (see page 31) and succeeded in keeping the organ- 

 isms alive for forty days. Levaditi "cultivated" 

 these spirochaetes in collodion sacs in the peritoneal 

 cavities of rabbits along with the serum of monkeys 

 (Macacus cynomolgus) and found that vibrio-forms 

 developed. 



A form of spirillum fever was observed by Hodges 

 and Ross in Uganda, which is believed by Moffat to be 

 different from the tick fever of the Zambesi region. 

 The spirochastes found by Hodges and Ross were 



