ON THK 



CRYFTOGAMOUS ORIGIN 



MALARIOUS AND EPIDEMIC 



FEVERS, 



BY 



J. K. /MITCHELL, A.M., M.D., 



L C 1 ICAt'SrElS I C I N 



PROFESSOR OF PRA 



E IN THE JEFFERSON MEDICAL COLLEGE 

 OF PHILADELPHIA. 



"It has also happened that reflecting men, guided by general ideas and analogies, 

 have enunciated truths which, only at some future period, could command general 

 acceptance and acknowledgment. This always has happened, and always will 

 happen, when the direct proofs of such a truth are wanting." BISCHOFF. 



" The infection may be aptly compared to the seeds of vegetables or the eggs of ani- 

 mals, which require a nice concurrence of certain degrees of heat, moisture real, 

 nutriment, c., to animate them." SIR GILBERT BLAKE. 



PHILADELPHIA: 



LEA AND BLANCHARD. 



1849. 



