7 2 



MORPHOLOGY AND CULTURE OF MICROORGANISMS. 



several of these ways may occur in a single organism. For this reason, 

 their reproductive power is very great; in power of repeating their like, 

 they fall just short of the bacteria. The union of a male and a female 

 form does not always precede multiplication; sexual connection and re- 

 production, though now united in many animals, were originally two 

 entirely distinct phenomena and, in the protozoa, though sexual union 

 may be concerned with the production of new individuals, it is often 

 especially associated with the regeneration of the protoplasm of the 

 parasites taking part in it. 



VK-:V> 

 r&alJ V; 



) > "'* *ii- \ 

 .^i^;.^:\ ^$%t$tiF$< 



-:-";..; -i ^^j^ga*. 



-^-^:,v 



\ 



FIG. 45. Stages in the division of Amoeba polypodia. (After F. E. Schulze and Lange, 



from Doftein.) 



The simplest of the methods of reproduction is simple binary division, 

 in which the organism divides into two equal parts. A modification of 

 this process is gemmulation, in which a small protozoon buds off from a 

 larger parent; sometimes many buds are formed rapidly, one after the 

 other, until the parent protozoon disappears in a swarm of daughter cells 

 When a protozoon divides at a single division to produce a large number 



