I04 



BACTERIA, YEASTS, AND MOLD ; 



the presence or absence of these motor hairs, 

 are known by the name of flagella. 



Spherical Bacteria 



They 



f -i- 



Cocci. 



The simplest type, of bac- 

 teria consists of those that 

 are in the shape of a minute 

 sphere. Their size differs 

 somewhat, but they are 

 always extremely minute, and 

 about all that can be said in 

 regard to them is that they 

 are spherical organisms, 

 sometimes possessing flagella 

 and sometimes apparently 

 without them. No internal 



Fig. 48. Cocci, bacilli, and bac 

 teria. a (Coccus), I? and c (Bacil- Structure is known. They 

 ius),sho^^&ge\\a.; d {Bacterium) multiply Sometimes in such 

 has no flagella. 



a way as ^o^ ^ ^^ 



to produce long chains (Fig. 49, a), ^o 00 n-j 



sometimes so as to produce groups of aCCOOOncrrrS 



.fours or groups of eight or sixteen __- jfTT^ 



(Fig. 49, b, c, d). The general name "ClJ ^^^B'' 



given to spherical bacteria is coccus, and xXXaJ 



to this name are sometimes prefixed ^'''- 49- Cocci,.show- 



mg methods of mul- 

 certain other syllables to indicate certam tiplication. a, Strep- 



characters. Streptococcus is a name tococcus; b, Micro- 

 given to cocci forming chains (Fig. 49, «<^'^«-f; <^ an^ <^' 



. . Sarcina. 



a), and Micrococcus to those forming 

 fours or irregular masses as at b. The term Sarcina is 

 the name given to those that form solid masses such as 

 shown in Fig. 49, c and d. 



