CLASSIFICATION 



^ Bacteria that are globular in form are called cocci. J( 

 * Cocci that divide in one direction of space and grow in chains are 

 called streptococci. )C (Fig. i.) 



^ Cocci that divide irregularly and form pairs or fours, or irregular 

 groups, are called micrococci. Those of this class that form pairs 



FIG. i. Large and very large streptococci. (Kolle and Wassermann.) 



are frequently called diplococci. When they form fours by division 

 in two directions, they are called tetrads. But when they divide 

 irregularly and form masses resembling bunches of grapes, they are 

 spoken of as staphylococci. X (Fig. 2.) 



FIG. 2. Staphylococci. Streptococci. Diplococci. Tetrads. Sarcinae. (. Williams.) 



X Cocci that divide in three directions are called sarcina. One 

 single coccus, by division in three directions, forms cubes of eight 

 or more, each of which becomes globular and equal in size to the 

 parent. 



