a. Various clubbed forms from 

 fresh preparations. 



b. Clubs with threads 

 which contain fragments re- 

 sembling cocci. 



**=*^*0& 



c. Threads with fragments like cocci and 

 club-shaped swellings. 



d. Line of growth 

 with threads extending 

 beyond the clubs. 



A 



•>fc: 



MA' 



e. Part of a cluster with frag 

 mentation in the interior. 



/. Section through \ of a perfectly- 

 developed cluster. 



Fig. 20 — Formation of clubs in Actinomyces bovis. Harz (after 

 Bostrom). (a. 6, and c are highly magnified — about 1000 to 

 2000 times ; d, e, and /, slightly magnified. ) 

 442 



