PLATE VIIL 
FORMATION OF SPORES IN BACILLUS. 
From photo-micrographs made in Havana and in New Orleans. Re- 
produced by permission of the National Board of Health. 
Figs. 1 and 2. — Bacillus (ulna ?) found in blood of yellow-fever 
patient (post-mortem) five days after collection. x 3,000 diam- 
eters by Zeiss’s ;/; in. objective. 
Fig. 1. — Rods joined in leptothrix chain. 
Fic. 2.— A single rod showing spore at one extremity. 
Fig. 3. — Spores of Bacillus developed in rotten potato, New 
Orleans, April, 1880. XX 1,500 by Zeiss’s ;4 in. objective. The 
large cells are some species of Saccharomycete, which was also pres- 
ent in the same specimen. 
Fie. 4. — Development of bacilli from spores, from culture ex- 
periment with fish gelatine solution. > 1,500 diameters by Zeiss’s 
zl; in. objective. 
