MORPHOLOGY. 



The spiral-shaped somewhat gpiriUa. 

 resemble the twisted part of a 

 corkscrew, and whether they have 

 few or many curves, whether 

 '^ loosely or tightly twisted, the one 

 name, "spirilla," covers all of this 

 Spirals. variety. 



Modifications or subdivisions of the cocci 

 have also been determined by watching their 

 manner of forming into groups as seen in grow- 

 ing cultures. 



Staphylococci is the term used to describe Staphylococci, 

 those which group in masses like grape- 

 clusters. 



Streptococci, to describe those with method Streptococci. 

 Df grouping into chain-like sections. 



Other forms of the micrococci are found to Diplococci. 

 group in pairs, and to describe these the term 

 diplococci is used. 



Those which form into groups of four are Tetrads, 

 called tetrads. 



Still another form is seen to make up groups Sarcinae. 

 of eight and sixteen, and to describe these we 

 use the term sarcinae. 



There are two main subdivisions of the bacilli, 

 namely; bacilli which are spore-forming, and 

 bacilli, which are non-spore-forming. By the 

 term spores we mean seeds or eggs of the bacilli. 



All forms of bacteria are dependent upon Oxygen. 

 certain conditions for their development; these 



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