MORPHOLOGICAL CLASSIFICATION OF BACTERIA. ;U 



The Variations in Development of Each Species. 



Though under varied conditions of growth the form of 

 any one species may vary considerably, yet these three inn in 

 divisions are permanent that is, micrococci always develop 

 into micrococci, bacilli into bacilli, and spirilla into spirilla. 



FIG. 2. 



e d e 



a Staphylococci b. Streptococci, c. Diplococci. d. Tetrads, e. Sarcinae. (Abbott.) 



FIG. 3. 



Diplococcus of pneumonia, with surrounding capsule. (Park.) 



Occasionally under peculiar conditions what are known as 

 involution-forms are produced, forms which may scarcely be 



