a 
Plate i. 
BACTERIUM TRUTTjE, 
from a characteristic local lesion in body muscles of brook trout dead after artificial inoculation. 
. for 20 minutes. The organism, leucocytes and debris. Alkaline methylene blue, 
of the heart’s blood of a brook trout dead in aquarium. X 1000. The organism, erythrocytes 
and leucocytes. Alkaline methylene blue. 
3. From a bouillon culture 3 days old. X 1000. Washed in distilled water, fixed at ii5°C. for 20 minutes. 
Aqueous fuchsin. 
4. From an agar culture 2 days old. X 1000. Aqueous fuchsin. 
Photomicrographs by Dr. Erwin F. Smith. 
