PLATE 4 
A. —Hemispherical extrusions on cell walls in the vicinity of the invading 
bacteria. X 500. 
B. —Bacterium delphinii showing flagella. Stained by Casares-Gil’s method. 
X 940. 
C. —Rods and spherical bodies from the sediment in the pellicle of bouillon 
cultures. 
D. —Agar plate, colony 4 days old showing ring of opaque areas. X 10. 
E. —Agar plate, colony 9 days old, by oblique transmitted light. X 10. 
F. —Agar plate, colony 2 days old, by oblique transmitted light. X 10. 
G. —Agar plate, colony 3 days old, by oblique transmitted light. X 10. 
H. —Culture in beef bouillon 4 days old, showing pellicle weighted down in 
center by a mass of sediment. 
