PLATE YII. 
DISSEMINATION OF THE BACTERIA. 
From photo-micrographs made in New Orleans. Copied by permission 
of the National Board of Health. 
Fic. 1. — Spirillum (Sp. ?) from water of salt marsh, near Salem, 
Mass. X 400 diameters by Beck’s 1 in. objective. 
Fig. 2. — Bacteria in distilled water (see note on page 107). 
X 1,000 diameters by Zeiss’s ;, in. objective. 
Fig. 3. — Leptothrix buccalis, epithelial cell, ete., from human 
mouth. X 1,000 diameters by Zeiss’s ; in. objective. 
Fic. 4. — Bacteria from human foeces. > 1,500 diameters by 
Zeiss’s ;!; in. objective. 
