PLATE III. 



Bacillus subtilis and spores of bacilli. Photo-micrographs by Dr. 

 Sternberg. 



FIG. 1. Spores of B. subtilis and micrococci, from surface 

 culture on gelatine and beef peptone. X 500 diameters. 



FIG. 2. Development of bacilli from spores, from culture ex- 

 periment with fish gelatine solution. X 1,500 diameters by Zeiss's 

 ^ in. objective. 



F IG . 3. Spores of Bacillus developed in rotten potato, New 

 Orleans, April, 1880. X 1,500 by Zeiss's ^ in. objective. The 

 large cells are some species of Saccharomycete, which was also 

 present in the same specimen. 



FIG. 4. Bacillus (B. ulna} containing a single spore at one ex- 

 tremity ; from putrid blood (of yellow- fever patient) obtained post 

 mortem. X 3000 diameters. 



FIG. 5. Bacillus subtilis, from surface of beef -peptone culture- 

 solution. X 500 by Zeiss's in. objective (D. D., dry); Balti- 

 more, 1884. 



