34 



ANAEROBIC HABITATS 



that termite flagellates are rapidly killed when they 

 come in close contact with the atmospheric air. They 

 can be cultured only under reduced oxygen tension or 

 under truly anaerobic conditions. This evidently can 

 be interpreted as an indication that the oxygen tension, 

 at least in the termite intestine, must be low. The 

 definite solution of this problem will have to come from 

 direct determinations, which doubtless could be per- 

 formed with modern micro methods, at least in some 

 animals. 



4. TISSUE'S AND SECRETIONS 



A great variety of parasitic invertebrates have become 

 established in the tissues and secretions {e.g., urine or 

 bile) of host animals. These habitats are seldom truly 

 anaerobic; it is therefore only with a certain reserve 

 that they are mentioned here. 



TABLE 5 

 Gas Tension in Various Organs of Warm-blooded Animals. 



