144 THE CONTAGIOUS TYPHUS 



able to distinguish some slight alterations in 

 their way of living, in the regularity of their 

 rumination and sleep. But in others, there 

 is no mistaking a something irregular and 

 unusual in their appearance and living; the 

 vital state is no longer the same. Thus an 

 animal which used to be cheerful and familiar 

 becomes silent and solitary ; it browses the 

 grass with less eagerness and avidity ; it lies 

 down more frequently and longer ; it lingers 

 by the side of the hedge along the field, or it 

 wanders about, here and there, with a listless 

 look, and without any object. Others moan 

 and complain, bellowing at intervals in an 

 unusual manner, very expressive of languor 

 and pain. 



But apart from seasons of epizootia, the 

 beasts too often exhibit these imperceptible 

 shades of variety in their looks and actions for 

 the attention to be struck by them ; these 

 changes, therefore, are almost always un- 

 noticed. 



However, the typhic miasma absorbed at 

 the same time by the respiratory and digestive 

 mucous membranes serves to modify the quali- 

 ties of the blood, and secretly reacts on the 



