CLASSIFICATION 



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

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

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



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

 (Kolle and Wassermann.) 



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

 family that resemble a corkscrew, are called spirilla. When they 

 are like long spiral threads they are called SpirocJUttd (Fig. 5) . 



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 pneumonia as the pneu- 

 mococcus. As the organism appears in the 

 diseased lung, or in the sputum, one diameter 

 of the coccus is invariably longer than 

 another, and the rule of equal diameters 

 cannot be applied to it. But in culture 

 media, the organism resembles a true coccus, 

 being globular and growing in chains. It is then called the 

 Streptococcus pneumoniae. It is common also to speak of mem- 

 bers of the family of Mycobacteriacea as bacilli, as they are more 



FIG. 4. Cholera 



vibrios. 



(Greene's Medical 

 Diagnosis.) 



