74 THE CONTAGIOUS TYPHUS 



congestive towards the nervous centre, inducing 

 stupor ; 4th, a flux of mucus from the mouth 

 and chest; 5th, a more intense, congestive, 

 and inflammatory flux or discharge from the 

 external or internal teguments the skin or the 

 mucous membrane of the digestive channels ; 

 6th, a period of adynamia and dejection, with 

 a tendency, in some cases, to a critical or 

 salutary rejection of the morbid matter by 

 the development of tumours or abscesses in 

 the skin; 7th, they are at once infectious 

 and contagious, epizootic or epidemic ; that 

 is to say, they are transmitted in different 

 degrees by contact, by inoculation, and at a 

 distance by the means of vitiated air; 8th, 

 finally and this is their leading character- 

 istic they are not subject to recurrence, each 

 individual that has once been affected, losing 

 in general all aptitude to contract the disease 

 a second time. 



This last characteristic, when well under- 

 stood, ought in reason to induce us to have 

 recourse to the preventive treatment, and such 

 has been the case with respect to the most 

 virulent amongst them small-pox and the 

 typhus of the ox. 



