THE CAUSE OF EUROPEAN FOUL BROOD. 



11 



iiig Bacillus 2)luton, Bacterium- eurydice is frequently found at this 

 stage of the disease, but in comparatively small numbers. 



If the intestinal content in a later stage of the disease — for exam- 

 ple, that represented in ^, figure 8 — is examined microscopically, 

 Bacillus fluton is still found in very large numbers, and Bacterium 

 eurydice when present will be relatively very much increased in num- 

 bers. A similar examination of the intestinal content represented in 

 €', figure 8, will usually show Bacillus pluton in large numbers, Bac- 

 terium eurydice in increased numbers, and in addition one may find 

 Bacillus alvei in comparatively. small numbers. 



7--^ 



Fig. 10. — Schematic drawina: representing a lonsitudlnal section of a larva at an early 

 stage of infection. Tlie position of the invading organism. liariUiin plufon, is along and 

 near the peritrophic membrane. (Original, i 



Bj" examining the fluid mass which flows from the body of a 

 larva when the disease is far ad\ anced and Mie body wall is broken, 

 one usually finds, together with Bacillus pluton, bacteria of different 

 species in considerable numbers. 



From this point on in the decay of the larva* the relative propor- 

 tion of the different microorganisms present varies markedly. AVhen 

 Bacillus alrei is present it increases very rapidh' in proportion to 

 the others. This rapid increase of Bacillus alrei in the larvie after 

 the death of the larva? accounts in a large measure for the frequency 

 with which thi.s species is mentioned in reports on this disease. 



