Fig. 7. — Azotobacter 21. Mannite-agar colony, 4 days old. Type C forming types D 



and I. 

 Fig. 8. — Azotobacter 22. Mannite-agar colony, 4 days old. Type C forming D 



also A in conjunction. 

 Fig. 9. — Azotobacter 11. From a filter paper strip in mannite-peptone solution, 16 



days old. Types A and B forming D. 

 Fig. 10. — Azotobacter 3. Mannite-peptone solution, 24 days old. Types Land M 



forming D. 

 Fig. 11. — Azotobacter 11. Mannite-peptone solution, 16 days old. Type D (stained) 



resulting from type C. 

 Fig. 12. — Azotobacter 6. From condensation water of mannite-agar slant, 1 day old. 



Type D (unstained) containing regenerative units. 



