GROUPING. 



37 



when seen in short segments, or when in longer threads 

 are twisted in the form of a corkscrew. (See Fig. 3.) 



FIG. l. 



a. Staphylococci. 6. Streptococci, c. Diplococci. d. Tetrads, e. Sarcinse. 



FIG. 2. 



xV 



-\ri 



a. Bacilli in pairs, ft. Single bacilli, c and d. Bacilli in threads, eand/, 

 Bacilli of variable morphology. 



FIG. 3. / 



-TV*" 



^Pw- 



a 6 c ^ 



a and d. Spirilla in short segments and longer threads the so-called 

 comma forms and spirals. 6. The forms known as spirochetse. c. The thick 

 spirals sometimes known as vibrios. 



3 



