INFLAMMATION OF THE PODOPHYLLOUS MEMBRANE. 139 



mation usually gives rise to sudden and unexpected lameness, 

 wliich is apt to disappear quickly. 



2. The product of parenchymatous inflammation, which 

 is thick and yellowish, perforates the skin ; swelling and 

 pain in that region are pronounced. The product of super- 

 ficial inflammation, which is thin and black in dark hoofs, 

 and gray in light colored ones, only separates the coronary 

 cushion from the horny wall at the point of exit, unattended 

 by swelliog or much pain in that region. 



3. Parenchymatous inflammation, especially when septic, 

 has a tendency to spread and to lead to fatal complications. 

 Superficial inflammation is not so liable to terminate in this 

 way. 



4. Parenchymatous inflammation is usually the result of 

 infection with pus producing bacteria, introduced by deeply 

 acting irritants. Superficial inflammation is the result of 

 less detrimental influences. 



