AEROBIC SPORE-BEARING NON-PATHOGENIC BACTERIA 317 



ILLUSTRATIONS 



The illustrations were drawn by Mrs. W. W. Ford and Mr. W. P. Didusch 

 from preparations illustrating the different phases in the morphology of the 

 various species. The preparations were always stained by gentian violet and 

 drawn from a Zeiss microscope with a 1/12 oil immersion lens and a compensating 

 ocular No. 8, giving a magnification of 1080 diameters. The attempt was made 

 to show the morphology of the vegetative cells which comes out best in certain 

 species at 6 to 7 hours and in others at 22 to 24 hours, the method of spore-for- 

 mation which varies in the time in which it appears, and the changes which occur 

 in the organism when grown on carbohydrate media. 



EXPLANATION OF PLATES 



Plate 1 



Fig. 1. Bacillus coli. Plain agar, 24 hours 



Fig. 2. Bacterium anthracis. Plain agar, 24 hours 



Plate 2 



Fig. 3. Bacterium anthracis. Plain agar, 4 days 



Fig. 4. Bacillus subtilis from milk. Plain agar, 20 hours 



Plate 3 



Fig. 5. Bacillus subtilis from milk. Glucose agar, 24 hours 

 Fig. 6. Bacillus vulgatus from milk (Bacillus mesentericus vulgatus). Plain 

 agar, 20 hours 



Plate 4 



Fig. 7. Bacillus vulgatus from milk (Bacillus mesentericus vulgatus). Glu- 

 cose agar, 24 hours 



Fig. 8. Bacillus mesentericus from soil (Bacillus mesentericus fuscus). 

 Plain agar, 72 hours 



Plate 5 



Fig. 9. Bacillus mesentericus from soil (Bacillus mesentericus fuscus). Glu- 

 cose agar, 48 hours 



Fig. 10. Bacillus aterrimus from human intestinal contents (Bacillus 

 mesentericus niger). Plain agar, 20 hours 



S 



Plate 6 



Fig. 11. Bacillus aterrimus from human intestinal contents (Bacillus 

 mesentericus niger). Glucose agar, 48 hours 



Fig. 12. Bacillus niger from Krai (Bacillus lactis niger). Plain agar, 48 

 hours 



