4r 



/^ 







9 



\'* 



Figs. 3-5. Development of the mixed colony from 

 a sintrle organism. Fig. 3. Stage of third division 

 Fiff 4. Stage of fifth division. Fig. 5. Stage ot 

 seventh division. The solitary L-form is now 

 vacuolated. (Hughes, W. H. (1953), J. gen. Micro- 

 biol., S,'W7.) 



[ facing page 66 



