POSITION— EELA T ION SHI PS 



19 



grow as branching threads and form spores in specially 

 developed fruiting organs (Figs. 10 to 16). The higher 

 thread bacteria (Fig. 17) do show branching and rudimentary 

 fruiting organs and are to be considered connecting links 

 between the true bacteria and the molds. 



Fig. 1.— a thread of blue-green 



Fig. 2.— a thread of small blue- 

 green algae. 



Fig. 3. — A thread of bacteria. 

 Compare with Figs. 1 and 2. 



Fig. 4. — A chain of spherical blue- 

 green algse. 



Fig. 5. — A chain of spherical 

 bacteria. 



Fig. 6. — A pair of spherical blue- 

 green algse. 



