SCHIZOMYCETES 



455 



has been seen that certain Bacteria do contain chlorophyll. Looking 

 at their morphological characters, so far as these are at present known 

 to us, it cannot be doubted that the nearest allies of the Arthrosporous 

 Bacteria are those Protophyta, Nostocaceae, Oscillariaceae, Chroococcaceae, 

 &c., which contain chlorophyll. Leuconostoc (Van Tiegh.) has already 

 been mentioned (p. 433) as an intermediate form. A gap certainly 

 exists between Arthrosporous and Endosporous forms ; but so far as 



FIG. 382. Bcggiatoa alba Trev. Curved and spiral forms. A, attached filaments. B H, por- 

 tions of spiral filaments ; H showing separate cells, E swarming (' spirillum ') with a cilium at each 

 end. Small dark circles are sulphur granules ( x 540). (After Zopf.) 



can be seen the latter stand nearer to the former than to any other 

 group, and the interval which separates them may become narrower with 

 farther knowledge. On the other side a connection appears to be in- 

 dicated between Bacteria and the Flagellata ; but more than this one 



