TE TRA GENUS. 565 



The organisms are found in small numbers in the 

 heart's blood, but are 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, when present in the cavities, prob- 

 ably 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. 



An interesting contribution to their relationship to 

 human pathology is made by Lartigau, 1 who succeeded in 

 demonstrating that the tetracoccus may be the cause of 

 a pseudomembranous angina, three cases of which came 

 under his observation. 



1 Phila. Med. Journal, April 22, 1899. 



