340 



DISEASES OF UNCERTAIN ETIOLOGY 



(6) An Intoxication (Manson). Caused by some germ living out- 

 side the bodv, in the soil, house or ship occupied by human 

 beings under certain conditions of temperature and moisture; 

 the toxin inhaled or swallowed causes the disease. 

 Evidence. Wiien patients are removed from an endemic area 



they begin to recover. 



The germ ma\- be carried from place to place. 



The same ship redevelops the disease annually on reaching 



the Tropics. 



Section of myocardium from a case of acute wet beriberi, showing more advanced 

 fragmentation. (From article by Herzog, and plate lent by the courtesy of TAe 

 Philippine [onrnal of Science.) 



(7) An Autointoxication (Deurch). 



This condition is asserted to be produced by substances formed 

 in the body. 



(8) Parasitic Causes (Sambon). 



The parasite in some way enters the body. 



Insects such as cockroaches may carry it. 



The infection is not by the fceces (Daniels), nor by air or water. 



