32 THE CONTAGIOUS TYPHUS 



the nervous centres, the pressure on the ver- 

 tebral line became intolerable, and the animal, 

 seized with vertigo, and almost delirious with 

 pain, would fall during this first period, as if 

 struck by lightning. 



The same phenomena are sometimes observed 

 in the typhoid fever of man, which offers 

 moreover some analogy with the contagious 

 typhus of the ox ; but as the ox and the horse 

 have likewise the real typhus fever, they may 

 some day supply us with the preventive virus 

 for that fever, in the same manner as the cow 

 now supplies us with the preventive virus for 

 the small-pox. 



2nd Period. In most cases the disease 

 pursued its course with greater or less 

 regularity ; the sick animal experienced gnaw- 

 ing pains or twitchings, and spasmodic shoot- 

 ings in the limbs, apparently attended with 

 pain. His thirst was insatiable, but he had 

 no appetite, the functions of the bladder and 

 intestines were impeded, then diarrhosa super- 

 vened, accompanied with dry, fetid, and some- 

 times bloody excreta. Thick viscid mucosities 

 dripped from the nostrils, mouth, and eyes. 

 The dorsal regions and the loins were con- 



