FIG. 1. a-/t. Different types of cocci, a. Single round cocci and simple diplococcal 

 forms, b. Lancet-shaped cocci (tj'pe of pneumococcus). c. Biscuit cocci (gonococcus). 

 d. Streptococci, e. Staphylococci. /. Tetrads (micrococcus tetragenus). g. Sarcina forms. 

 h. Capsulated cocci. i*-tf. Bacilli. i l -i 3 . Ordinary types of different shapes, i 4 , i 5 . Bacilli 

 with granular or vacuolated protoplasm, i 6 , ' 7 . Large forms, k-n. Spirochaetes. k 1 . Spiro- 

 .chaete with open turns (spirochajte refringens). W. Possible longitudinal splitting of 

 spirochsete. ^ 3 . Two individuals separating, in. Spirochuete with irregular turns, n. 

 Spirochsete with close turns (spirocheete pallida). o. Mixed type of fusiform bacilli and 

 spirilla (see Chapter XVII.). p. Spirilla, p^. Comma type. p 2 . Spifillary type. q. Differ- 

 ent types of flagellum formation, q*-. Terminal flagella. q z . Peritrichous formation. 

 q 3 . Flagella on spirillum, q*. Large flagellated spirillum, r 1 . Wreathed mass of flagella. 

 '2. Detached flagellum. r3. Detached flagella assuming ring form. s. Types of sporula- 

 tion. s 1 . Terminal, s 2 , s 4 . Mesial, s 3 . Subterminal. s 5 . Detached spores, t 1 , t 2 . Involu- 

 tion forms (b. diphtherias), u. Hofmann's bacillus. v^-v s . Involution forms (b. pestis). 

 w. Streptothrix actinomyces. x. Leptothrix innominata. y. Thiothrixitenuis. 



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