288 The Influence of Ionised Air on Bacteria. 



interpreted by some such reversal occurring normally in the infected animal, 

 on account of changes in the blood serum or peritoneal fluid. 



DESCRIPTION OF PLATES. 



—B. anthrocis. 20 minutes' exposure. 

 —B. anthracis. 30 minutes' exposure. 



Fig. 9. — B. anthracis. 50 minutes' exposure. 

 Fig. 10. — Pnvumoroi-r.it. 70 minutes' exposure. 



Fig. 11. — B. roli communis, lj, Ah, and 18 hours' exposure. 

 Fig. 12. — B. typhosus. 1 hour and 2j hours' exposure. 



Fi'4. 13. — B. roli conuivnds. £ hour and 1 hour's exposure. 

 Fig. 14. — B. asiaticce cholera. £ hour and h hour's exposure. 

 Fig. 15. — B. dysenterica Shiga, h hour and 1 hour's exposure. 



Plate 11. 



Fig. 16. — B. asiaticce choleras in hydrogen. 1 hour's exposure. 

 Fig. 17. — B. typhosus in hydrogen. 1 hour's exposure. 

 Fig. 18. — B. roli rout iivi ..is in hydrogen. 1 hour's exposure. 



Plate 12. 



Figs. 3, 4, 5. — Point discharge. 



Fig. 6. — Streamers in positive point discharge. 



Fig. 20.— B. typhosus in nitrogen. Top. 



Fig. 21. — B. asiaticce ckolerce under quartz and paper. Bottom. 



