56 PBINCIPLES OP YETEBINAEY SURGEEY 



4. As the result of the altered condition of the -walls of 

 the blood vessels a more or less abundant transudation of liq. 

 sanginis escapes from the dilated blood vessels, to which is 

 added the emigration of red blood cells from the capillaries, 

 these two representing the main cause of the so-called 

 "inflammatory swelling." 



5. The proliferation of the fixed connective tissue cells 

 together with the emigrated white blood corpuscles are 

 actively concerned in the production of the so-called "cellu- 

 lar infiltration of the inflamed tissue." 



Causes of Inflammation. 



Give a practical classification of the causes of inflammation. 



1. Aseptic (mechanical, thermal, chemical). 



2. Septic (due to the influence of pathogenic micro- 

 organisms). 



Enumerate some of the most important causes of inflammation. 



1. Mechanical irritations, as contusions, wounds, pres- 

 sure, laceration, etc., produce a traumatic inflammatory 

 process. It is aseptic in healing by first intention, subcu- 

 taneous tendon and muscle ruptures, in that form of podo- 

 dermatitis commonly termed founder ; finally, in all inflam- 

 mations of a non-infectious nature of articulations', bones, 

 bursse, tendons, etc. 



2. Thermic irritations, as heat and cold. 



3. Chemical irritants, as the application of vesicants, the 

 action of acids or alkalies, the subcutaneous injection of 

 certain agents, followed by a purulent inflammation without 

 the presence of pus producing bacteria, in such pus as creolin, 

 ammonia, turpentine. 



