PLATE 6 
Small sporulating rods. 
Fig. 61.—Typical sporulating rods. Azotobacter Beijerinckii (No. 5). Beef agar, 2 
days. 
Fig. 62. —Weakened sporulating rods. A. agile (No. 7). Mannite-nitrate solution, 
3-weeks. 
Fig. 63.—Larger sporulating rods. A. chroococcum (No. 19). Beef agar, 10 days. 
Fig. 64.—Threads producing gonidia. A. Beijerinckii (No. 5). Milk, 2 months. 
Fig. 65.—Threads producing gonidia, regenerative bodies, and endospores. A. 
Beijerinckii (No. 6). Beef broth, 1 week. 
Fig. 66.—Arthrospore formation; encysted symplasm. A. Beijerinckii (No. 6). 
Milk, 7 weeks. 
Fig. 67.—Rods producing gonidia and regenerative bodies. A . Beijerinckii (No. 6). 
Mannite-nitrate solution, 2 weeks. 
Fig. 68.—Conjunction and zygospore formation. A. Beijerinckii (No. 6). Mannite- 
nitrate solution, 2 weeks. 
Fig. 69.—Formation.of gonidangia and regenerative bodies. A. Beijerinckii (No. 6). 
Mannite-nitrate agar, 4 weeks. 
Fig. 70.—Spores producing regenerative bodies. A. Beijerinckii (No. 6). Beef agar, 
2 weeks. 
Fig. 71.—Upgrowth to large sporulating rods. A. Beijerinckii (No. 6). Mannite- 
nitrate agar, P H 8.0, 3 weeks. 
Fig. 72.—Development to large sporulating rods. A. Beijerinckii (No. 6). Mannite- 
nitrate agar, Ph 7.5, 4 weeks. 
