MORPHOLOGICAL STUDIES 
Eberthella sanguinaria (Moore) is a n on-motile, gramnegative organism, 
showing no capsule, endo spores, or irregular forms. The size of the organ¬ 
ism varies, the usual dimensions ranging from 1 to 2 microns in length, and 
from 0.5 to 0.8 microns in width. The Brownian movement is well marked. 
The ends are rounded; the organism stains readily with most analine stains, 
the peripheral structure taking the strain most heavily. Though the organ- 
FIG. 3.—EBERTHELLA SANGUINARIA (MOORE) ON AGAR SLANT 
ism is gram negative, this stain is not readily taken. Cases have been noted 
when staining directly from the blood that the organism had a tendency 
toward bipolar staining, thereby rendering the possibility of confusion with 
members of the pasturella group. In direct isolations there is a tendency 
toward coccoid shape in formation. Continuous cultivation on artificial 
medium causes the organism to loose the property of peripheral staining. 
Notation. Studies on the causative organism, except where otherwise indicated, are the 
observations of this laboratory. The technique is that of Pure Culture Study of Bacteria, 
as adopted by the Society of American Bacteriologists. 
