DESCRIPTION OF PLATE Y. 

 Bacillus Anthracis. 



FIG. 1. From a cover-glass preparation of blood from the spleen of a guinea- 

 pig inoculated with blood from a sow. x 1200. Powell and Lealand's 

 apochromatic T \ Horn. imm. E. P. 10. 



FIG. 2. From a section of a kidney of a mouse. Under a low power the 

 preparation has exactly the appearance of an injected specimen. Under 

 higher amplification the bacilli are seen to have threaded their way along 

 the capillaries between the tubules, and to have collected in masses in 

 the glomeruli. Stained with Gram's method (gentian-violet), and eosin. 

 x 500. 



FIG. 3. Bacillus anthracis and Micrococcus tetragenus. From a section from 

 the lungs of a mouse which had been inoculated with anthrax three days 

 after inoculation with Micrococcus tetragenus. A double or mixed infection 

 resulted. Anthrax-bacilli occurred in vast numbers, completely filling the 

 small vessels and capillaries, and in addition there were great numbers 

 of tetrads. Stained by Gram's method (gentian-violet), and with eosin. 

 x 500. 



