INTRODUCTION. 



31 



growtK these projections coalesce, and new blood-vessels 

 shoot into them from the neighbouring parts. Thus, by 

 formation of successive crops of granulations, their fusion 

 and organisation, the ulcer is constantly reduced in size 

 whenever the activity of repair exceeds that of disin- 

 tegration. Thus, also, we generally see pus produced in 

 considerable quantity from a granulating surface ; but it 

 seems possible by means of dressings to increase granula- 

 tion at the expense of suppuration, and thus promote 

 rapidity of healing of a wound. The granulation tissue 

 tends to the conversion of its cells (exudation corpuscles) 



#©1 





FiG. 4.— Granulation tissue. (After Gant.) To the left, granulation corpuscles 

 with rounded pus cells. To the right, the newly formed vascular loops. 



into proper tissue-elements resembling those of ordinary 

 fibrous tissues. The process of cicatrisation, whereby the 

 breach is ''skinned over,'' will be dealt with when we 

 treat especially of wounds. Ulcers are of various kinds, 

 according to their shape, products, causes, and granula- 

 tions. 



The Simple or Healthy Ulcer occurs in animals of 

 healthy constitution, presents small, vascular granulations, 

 uniform in size and in diffusion over the surface, which is 

 concave. Laudable pus is produced, and the edges are 

 not hard. 



The Inflammatory Ulcer depends upon an irritable state 

 of the constitution, and presents few granulations, a raw 



