436 LECTURE XVII. 



the blood ; what transudes never consists of anything 

 but serous fluids. 



I am accordingly of opinion, that, in the sense in which 

 it has usually been assumed to exist, there is no inflam- 

 matory exudation at all, but that the exudation which 

 we meet with, is essentially composed of the material 

 which has been generated in the inflamed part itself 

 through the change in its condition and of the trans- 

 uded fluid derived from the vessels. If therefore a part 

 possesses a great number of vessels, and particularly if 

 they are superficial, it will be able to furnish an exuda- 

 tion, ' since the fluid which transudes from the blood con- 

 veys the special products of the tissue along with it to 

 the surface. If this is not the case, there will be no 

 exudation, but the whole process will be limited to the 

 occurrence in the real substance of the tissue of the 

 special changes which have been induced by the inflam- 

 matory stimulus. 



In this manner, two forms of inflammation can be 

 separated from one another ; the purely parenchijmatous 

 inflammation, where the process runs its course in the 

 interior of the tissue, without our being able to detect 

 the presence of any free fluid which has escaped from the 

 blood ; and the secretory (exudative) inflammation (which 

 belongs more to the superficial organs) where an increased 

 escape of fluid takes place from the blood and conveys 

 the peculiar parenchymatous matters along with it to the 

 surface of the organs. That there are two different forms 

 is clearly shown by the fact that they occur for the most 

 part in different organs. There are certain organs which, 

 under all circumstances, only suffer from the parenchy- 

 matous affection, and others again which in nearly every 

 instance exhibit a superficial exudative inflammation. 



The distinction into adhesive and purulent forms, which 

 has generally been made in accordance with the example 



