164 Disturbances of the Blood. 



lymphoid structures of the body (lymph glands [in lymphatic 

 leukaemia] ; bone-marrow and spleen [in lieno-medullary leu- 

 kaemia] ) ; and the coincidence of a general debility, fever, and 

 tendency to hemorrhage mark the condition as a serious affection. 

 Nothing definite is known of the aetiology of the affection either 

 in man or the animals; it has been conjectured, however, that the 

 cause may be of an infectious nature. 



