PLATE Va: 
From photo-micrographs made in Havana and New Orieans. Re- 
produced by permission of the National Board of Health. 
Fie. 1.— Spirochete (plicatile?). From foul bilge-water, Hav- 
ana, Sept. 1879. > 1,450 by Zeiss’s ;4 in. objective. 
Fig. 2. — Vibrios from water of harbor, Havana, near discharge 
of sewer, Aug., 1879. Xx 1,450 diameters by Zeiss’s ;4 in. 
objective. ; 
Fie. 3. — Sarcina (sp. ?). From standing water in flower-vase, 
Lafayette cemetery, New Orleans, April, 1880. > 400 diameters by 
Beck’s 1 in. objective. 
Fie. 4.— Spirillum (volutans ?). From foul gutter-water, New 
Orleans, May, 1880. > 600 diameters. 
