O BACTERIA 



^ Motile micrococci are those that divide in two directions of space, 

 and have flagella. ^They are known as planococci. 



Micrococci that divide in three directions, and are motile, are 

 called piano sarcince. (Fig. 3.) 



yJBacteria that resemble straight rods are called bacilli. These 

 may be short and thick, or long and thread-like; are never curved, 

 but may be slightly bent. 4^ 



FIG. 3. Planosarcina ureae, showing very long flagella. 

 (Kolle and Wassermann.) 



4- Bacilli may grow singly or in chains; may be flagellated; contain 

 spores and gonidia; or, may be devoid of flagella. *f" 



Members of the spirillaceae that resemble a curved rod, or are 

 comma shaped, are known as vibrios. (Fig. 4.) Those of the 

 same family that resemble a corkscrew, are called spirilla. (Fig. 5.) 

 When they are like long spiral threads they are called spirochcztce. 



Any of these different members of the family of Spirillaceae may 

 grow in "chains. 



In clinical medicine it is common to speak of the streptococcus 

 lanceolatus as the pneumococcus. As the organism appears in the 

 diseased lung, or in the sputum, one diameter of the coccus is invaria- 

 bly longer than another, and the rule of equal diameters cannot be 



