GROUPING. 



37 



when seen in short segments, or when in longer threads 

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



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Fig. 1. 



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



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V^ 





Fig. 2. 

 \ 



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.\K' 



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n. Bacilli in pairs. 6. Single bacilli, c andd. Bacilli in threads, 

 e and/. Bacilli of variable morphology. 



Fig. 3. 



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1 1 

 ) 



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

 forms and spirals, h. The forms known as spirochseta. e. The thick spirals 

 sometimes known as vibrios. 



3 



