cxlvi 



THE BEGINNINGS OF LIFE. 



us concerning the infective diseases as a class, our difficulties 

 will be much diminished: simple and obvious conclusions 

 will appear. 



/ Many of them 

 capable of 

 arising de 

 novo. 



PARASITIC DISEASES AFFECTING 



/- External (cutaneous) surface. 

 I Internal (mucous) surfaces. 

 J Closed (serous) cavities. 

 { Tissues of organs or parts. (Psorospermia, 



Cystice rci Nematoids, etc.) 

 Blood. (Bacteridia in ' Malignant Pustule,' 

 Psorospermitz in ' pebrine,' etc.) 



l> 



Apparently 



caused and 



propagated by the 



presence and 



self-multiplication 



of living units. 



In the first place, we find a group of diseases due to the 

 presence upon or within the body of parasitic organisms. 

 These are partly local and partly general affections, the latter 

 being intensely contagious, and on that account frequently 

 confounded with other general infectious diseases in which 

 living organisms do not occur. These general parasitic 

 diseases are propagated by the presence and multiplication 



