FIRST PART. 



TJie History of the Contagious Typhus of the Ox, 

 from the remotest times down to the present 

 day. 



I. 



GENERAL, local, and particular causes of de- 

 struction are constantly reacting on organized 

 creatures, and these causes account for those 

 epiphytic diseases which infest plants, the epi- 

 zootic diseases which spread mortality among 

 the brute creation, and the epidemic, which 

 strike and are fatal to the human species. Thus 

 it is that we particularize at present, in the 

 vegetable kingdom, the disease which has 

 attacked the vines, olive-trees, and potatoes; 

 in the animal kingdom, the silkworm sickness, 

 and the cholera, and the typhoid fever of 

 cattle : so that we may safely say, that one or 

 other of these diseases is always, at a given 



