Fig. i. — Azotobacter n. Mannite-nitrate solution, 5 days old. T) r pcs A and La. 



Some cells in conjunction. 

 Fig. 2. — Azotobacter 21. Contact preparate from a colony on marmite agar, 4 days 



old. Types A, L. Most ceils in conjunction. 

 Fig. 3.— Azotobacter 23. Contact preparate from a colony on mannite-agar, 4 days 



old. Types A, B, I, Ka, and many conjunct ceils. 

 Fig. 4. — Azotobacter 13. Mannite-nitrate solution, 17 days old. Type KX. 

 Fig. 5. — Azotobacter 14. Mannite-nitrate solution, 5 days old. Type B forming I. 

 Fig. 6. — Azotobacter 8. Beef bouillon. Type B forming types I and J. 



