Fig. 13. — Azotobacter 24. Mannite-nitrate solution kept 5 days after having been 

 heated 1 minute at 96 ° C. Types I and F developing from D. Some I 

 germinating in conjunct stage and inclining to form spores. 



Fig. 14. — Azotobacter 1. Mannite-nitrate solution, 10 days old. Types B, K/i, E, and 

 Fa developing from stained and unstained type D. 



Fig. 15. — Azotobacter 15. From condensation water of a mannite-nitrate agar slant, 

 2 days old. Types Fa and F/3 developing from type D. 



Fig. 16. — Azotobacter 17. Mannite-soil-extract agar, 2 months old. Types E, Fa, 

 K0, and G developing from type D. 



Fig. 17. — Azotobacter 17. Mannite-nitrate agar, 10 days old. Preparate treated 

 with hot aqueous fuchsin. Type G, partially dissolved; also K</>. 



Fig. 18. — Azotobacter 7. Mannite-soil-extract solution, 14 days old. Type H 

 forming D. 



