GROUPING. 



37 



when seen in short segments, or when in longer threads 

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



0% 



FlQ. 1. 



0000 0° 



00 



oo . 





?» OS, ego 



u. staphylococci. 6. Streptococci, c. Diplococci. d. Tetrads, e. Sarcinae. 



^ \ , '. 

 ■ > , > ! 



* » -- 



Fig. 2. 









d e S 



a. Bacilli in pairs, b. Single bacilli, c and d. Bacilli in threads. 

 e and/. Bacilli of variable morphology. 



Fig. 3. 







d 



a & c 



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

 forms and spirals. 6. The forms known as spirochseta. c. The thick spirals 

 sometimes known as vibrios. 



3 



