JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XI, 



Illustrating Mr. J. Cossar Ewart's observations on the Life- 

 History of Bacillus anthracis. 



Fig. 1. — Spores which have escaped from the filaments. 



Fig. 2. — One spore dividing into four sporules. 



Fig. 3. — Sporules forming a zooglcea. 



Figs. 4 and 5. — A sporule developing into a rod, which in Fig. 5 is 

 beiginning to divide into two segments. 



Fis. 6. — A rod undergoing segmentation. 



Fig. 7. — Rods with bodies in them, which may be looked upon as 

 vacuoles or nuclei. 



Fig. 8. — A newly developed filament. 



Fig. 9. — Filament in which the protoplasm has divided into somewhat 

 long segments. 



Fig. 10. — A filament in which the protoplasm has undergone further 

 segmentation. 



Fig. 11. — The first appearance of the spores in the form of minute 

 specks at the adjacent ends of the segments. 



Fig. 12. — Shows the fully developed spores which have been formed by 

 the contraction of the protoplasm. 



Fig. 13. — The spaces between the spores have become granular, an indi- 

 cation that the filament is disintegrating. 



Fig. 14. — The granular appearance has gone, and only the faintest 

 possible indication of the filament is visible. 



Fig. 15. — A filament from which nearly all the spores have escaped. 

 Minute clear spots are seen at the points formerly occupied by the spores. 



Fig. 16. — A filament which has broken into short segments, in some of 

 which spores still persist. 



Fig. 17. — A filament still more disintegrated; in one of the segments a 

 dumb-bell-shaped spore is visible. 



Fig. 18. — Matted rods in the subcutaneous tissue, from which rods extend 

 an rows between the connective-tissue fibres. 



Fig. 19. — Rods forming a zooglcea. 



Fig. 20. — A rod undergoing segmentation. 



Fig, 21. — A rod lengthening into a filament. 



Fig. 22. — A filament containing spores, becoming granular at one end 

 dshowing transverse lines between the spores. 



Fig. 23. — Spore-bearing filaments forming a rope work. 



Fig. 24. — Part of a filament containing a spore in process of division. 



Fig. 25. — Shows the different stages through which a spore passes in its 

 development into a rod. 



Fig. 26. — Short filaments containing spores. 



Figures A to E, 



Illustrating Dr. Klein^s Paper, ^' Experimental Contribution 

 to the Etiology of Infectious Diseases with special refer- 

 ence to the Doctrine of Contagium vivum." 



Fig. a. — Bacillus of infectious Pneumo-enteritis of the pig, cultivated 



