634 



A MANUAL OF BACTERIOLOGY 



conditions, and an infusion of rabbits' faeces, kept at the ordinary 

 temperature, is perhaps as good a cultivating medium as any, the 

 changes being watched by means of interlamellar films. Kepro- 

 duction may be either asexual or sexual, and may be endogenous, 

 within the host, or exogenous, outside the host. In the asexual 



FIG. 57. Diagram of Development of Coccidia. 1 



cycle, division of the protoplasm and nucleus of the coccidium 

 takes place and the cyst comes to contain large numbers of spores 

 (Fig. 57, A). The cyst-wall then ruptures, the spores are liberated, 

 pass into other intestinal or hepatic cells and reproduce the 

 coccidium once more (Fig. 57, A). In the sexual cycle, the 



1 This diagram is reproduced by permission from Daniel's Tropical 

 Medicine and Hygiene, 2nd ed. 1913 (John Bale, Sons and Danielsson). 



