Fig. 19. — Azotobacter 2. Mannite-nitrate agar, 23 days old. Spores forming type D. 

 Fig. 20. — Azotobacter 2. Mannite-nitrate agar, 6 days old. Types L and F, endo- 



spores and exospores and dissolving of spores to type D. 

 Fig. 21. — Azotobacter iS. From a filter paper strip in mannite solution, 25 days old. 



Type L with gonidia, forming B (type J\). 

 Fig. 22. — Azotobacter 7. Mannite-soil-extract agar, 2 months old. Types E and F 



forming B. 

 Fig. 23. — Azotobacter 7. Mannite-soil-extract agar, 2 months old. Type B, formed 



by types E and F, germinating to type G. 

 Fig. 24. — Azotobacter 7. Mannite-soil-extract agar, 2 months old. Type K7. 



