SPIROCHETOSIS AND RARE INFECTIOUS DISEASES 139 
ti DEVELOPMENT 
<< FROM 
Sees COCCOID: BODIES MULTIPLICATION 
° ey * 
Pe TRANSVERSE DIVISION 
° 
0 
MULTIPLICATION OF 
I=COCCOID BODIES 
IN CELLS OF ARGAS 
FORMATION OF 
Coccolo BODIES 
iN BLOOD 
a caereres OF 
COCCOID BODIES 
(N CELLS OF ARGAS 
Fic. 15. The life-cycle of Treponema (Spirocheta) gallinarum illustrated dia- 
grammatically. (Hindle) 
the spirochetes further penetrate into various organs of the tick, 
including the ovary and Malpighian tubules where they multiply 
by ordinary fission. In the cells of these organs the spirochetes 
break up into coccoid bodies. Other spirochetes remaining in the 
lumen of the gut also form coccoid bodies. These circumstances re- 
