310 



THE MICROSCOPE AND ITS REVELATIONS. 



PLATE XII. 



LIFE-HISTORY OF BACILLUS ANTHRACIS (after Ewart), 



Fig. 1. Spores which have escaped from the filaments. 2. Division of spore into four sporules. 

 3. Sporules forming a zooglaea. 4, 5. Sporules developing into a rod, which at a divides into 

 two segments. 6. A rod undergoing segmentation, and the segments showing flagella. 7. Rods 

 with corpuscles (yacuoles or nuclei?). 8. A newly -developed filament. 9. Filament in which the 

 endoplasm has divided into somewhat long segments. 10. Further segmentation of a filament. 



11. First appearance of spores as minute specks in the endoplasm near the ends of the segments. 



12. Fully developed spores formed by contraction of the endoplasm. 13. Granular matters in 

 spaces between spores, indicative of disintegration of filament. 14. Almost complete disappear- 

 ance of filament. 15. Filament from which spores have escaped. 16. Filament broken into short 

 segments, of which some still contain spores. 17. Filament still more disintegrated, with one of 

 the spores, a, in process of division. 19. Rods forminer a zooglaea. 20. Rod undergoing segmenta- 

 tion. 21. Rod lengthening into filament. 22. Filament containing spores becoming granular at 

 one end, with transverse lines between spores. 23. Spore-bearing filaments forming rope-work. 

 24. Part of filament containing a spore in process of division. 25. Different stages of development 

 of spore into rod. 26. Short filaments containing spores. 



