TETRAGENUS. 445 



The organisms are found in small numbers in the 

 heart's blood, but are v numerous in the spleen, lungs, 

 liver, and kidneys. 



House-mice and field-mice are comparatively immune ; 

 dogs and rabbits are also highly resistant. Guinea-pigs 

 sometimes die from general infection, though sometimes 

 local abscesses may be the only result of subcutaneous 

 inoculation. 



The tetragenococci are of no special importance in 

 human pathology, but probably hasten the tissue-necrosis 

 in tuberculosis pulmonalis, and may aid in the formation 

 of abscesses of the lung and contribute to the production 

 of the hectic fever. 



