TYPHUS CONTAGIOSUS BOUM. 313 



into the general circulation, speedily followed by fermenta- 

 tion of the blood within the body, resulting in boils, or 

 small carbuncles containing pus, which soon break and 

 discharge. All of this is accompanied by sympathetic 

 fever, (typhus so called) gradual and progressive in its 

 character, till the blood and tissue of the body are no 

 longer fit for the purposes of life, and the animal dies an 

 exhausted and miserable object, in from a few days to one, 

 two and three weeks from the time of attack. 



Causes. Certain conditions of the air and earth, as heat 

 and moisture, cold and dryness; contagion. These may 

 be called the exciting causes ; something still being wanted 

 in the system of the animal to form the predisposing cause 

 — as debility, and a low standard of general health. In- 

 deed, the conditions which sometimes exist in, and form 

 pleuro-pneumonia, are capable of producing contagious 

 typhus. I am borne out in this opinion by Jessen, who 

 among the discordant opinions and theories of Europe, has 

 declared the disease to be associated with pleuro-pneumonia. 

 Dr. Greenhow also says that contagious typhus existed 

 side by side with pulmonary disease in England, in the 

 middle of the last century. Why theorize then any fur- 

 ther, for it is so plain that those who run can read, that 

 veterinary surgeons, politicians and notoriety hunters have, 

 at the expense of the suffering farmers of Europe, con- 

 tinued to perplex and puzzle too long? The same has 

 been attempted in Pennsylvania, and other States of the 

 Union, even in cases of simple sporadic pleuro-pneumonia 

 in milch cows, whereby, with a power of metamorphosis 

 far outstripping that of Publius Ovidius Naso, the one 

 disease has, as if by the wand of the magician, been con- 

 verted at once into that of another. 



Symptoms. We are told that the disease has its period 



