156 THE CONTAGIOUS TYPHUS 



edge of the eyelids and at the nasal orifices, 

 or on the excoriations of the skin, quickly pass 

 into the state of larvae. The air they expire 

 is cold and infectious ; the native caloric, ex- 

 tinguished in every focus successively, disap- 

 pears ; the vaginal mucous membrane is tume- 

 fied, the anal opening gapes, and from it flows 

 a bloody and decomposed liquid which the 

 rectum can no longer expel. The mouth, half 

 open and coated with a thick glutinous foam, 

 vainly tries to inhale long draughts of air 

 which can no longer reach the lungs. Finally, 

 if the animal is lying down, he expires in 

 slow agony, his head borne down by its own 

 weight; or, if standing, he sinks and falls 

 down, his death having anticipated the fall. 



Such are the symptoms the subjective 

 signs which enable us to detect the conta- 

 gious typhus of the ox. But all animals do 

 not exhibit these disorders of the vital func- 

 tions with the same regularity and excess. 

 Some of these we have seen, from first to last, 

 sustain the internal effects of the morbid pro- 

 cess in some sort passively without reveal- 

 ing any deep derangements in the nervous, 

 respiratory, and digestive functions. The 



