96 THE CONTAGIOUS TYPHUS 



same nature which generates life and health 

 generates disease and dissolution, and when 

 the former are neglected the latter will 

 prevail. 



In the prosperous and favoured countries of 

 the temperate zone, such as England and 

 France, these extreme variations in the 

 seasons, which are always the cause of a de- 

 ficiency or alteration in the production of 

 fodder, are equally the cause of the numerous 

 epizootics which attack all the herbivorous 

 species, and particularly those to which oxen 

 fall victims, such as the tumourous typhus (le 

 typhus cliarlonneux), the so-called aphthous 

 fever, the contagious peripneumonia (which is 

 not liable to return and is prevented by inocu- 

 lation), parasitical cutaneous disease. 



But in less favoured countries, in those 

 which are damp, argillaceous, swampy, inun- 

 dated by the overflows of their lakes and 

 rivers, or by the reflux of the sea, there is 

 deposited a slimy or brackish water, which a 

 temporary torrid heat afterwards causes to 

 ferment ; and then a superabundance of life, a 

 teeming vegetation, springs up in all directions. 

 In the midst of this swarming vitality live and 



