PART II. MORPHOLOGY 



CHAPTER III 

 FORM AND STRUCTURE OF BACTERIA 



Introduction. The form, and to some extent the struc- 

 ture, of bacterial cells is subject so some variation depending 

 ,upon the temperature at which cultivation takes place and 



FIG. 4. Form types of bacteria. Photograph of models, showing form and rela- 

 tive size, i, M. pyogenes var. aureus ; 2, 3, 4, micrococcus undergoing fission ; 

 5, Str. pyogenes; 6, tetrads; 7, sarcina ; 8, B. typhosus ; 9, B. subtilis; 

 10, Bact. anthracis; n, 12, Mps. comma; 13, Sp. obermeieri. 



the chemical constitution of the media on which the bacteria 

 are grown. In order that accurate information may be 

 gained in regard to form and structure it is necessary that 



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