ELEMENTS OF HIPPOLOGY. 



45 



and, as a result, increased combustion (oxidation), manifested by 

 heat, and augmented nutrition, manifested by swelling. 



Pus may be confin- 

 ed by limiting mem- 

 branes provided by 

 Nature to prevent the 

 migration of the pus 

 to sound tissues. 

 Such a sore is termed 

 an abscess. If the 

 pus escapes externally 

 from an abscess and 

 the channel of escape 

 is similarly lined by 

 a limiting membrane. 



Figure 31. — Highly Magnified Section 

 of the Wing of a Bat, Not Inflamed. the ch annel is termed 



a sinus. 



Pus forming with- 

 out such a limiting 

 membrane invades the 

 surrounding tissues 

 and destroys them. 

 Such a sore, when open 

 is called an ulcer. 



Any injury or 

 wound in which pus 

 forms is said to sup- 

 purate or to be in- 

 fected. If the pus is 

 absorbed into the cir- 

 culation while the in- 

 jurious germs are still 

 active, abscesses are sometimes set up in organs distant from 

 the original injury; at other times the infection attacks the 



Figure 32. — Highly Magnified Section 

 of the Wing of a Bat, Inflamed. 



