1 2 The Farmer's Veterinary Adviser. 



through the skin, but also, at times, through a mucous 

 membrane into the lungs, bowels, etc., or through a serous 

 membrane into chest, abdomen, etc. When an abscess is 

 formed in bone or dense fibrous tissues which press equally 

 on all sides, it may remain imprisoned for months and years 

 after all inflammation has subsided, constituting an indolent 

 or cold abscess. When the imprisoned pus is inclosed by thick 

 fibrous or resistant tissues at all points but one, it will make 

 its way along the narrow passage of yielding tissue, but as 

 the resulting outlet is constricted, long, and tortuous, the 

 contents cannot readily escape through it nor the walls of 

 the abscess contract so as to expel the confined pus, and the 

 latter goes on forming and discharging through the narrow 

 outlet for months or years. This is z, fistula or sinus. 



Healing by Adhesion or First Intention. When a clean- 

 cut wound has the blood staunched and its lips brought to- 

 gether without exposure to the air (or contact with pyogenic 

 germs), they adhere at once and heal without pus or any 

 appreciable formation of new tissue. Here the lymph 

 thrown out on the cut surfaces agsrlutinates them, and the 

 cells, multiplying, form a thin layer of embryonic tissue 

 which gradually develops into a fibrous structure and re- 

 pairs the breach without any perceptible scar. 



Healing by Second Intention. Granulation. When a 

 wound has caused destruction of tissue, or when a simple 

 incision is left exposed to the air, the breach is filled up by 

 new tissue through the process known as granulation. The 

 superficial layer of lymph thrown out on the raw surface 

 becomes oxidized and degenerates into pus, while the deeper 

 layers become solid, fibrillated, the seat of cell-growth, and 

 are finally transformed into a fibrous structure. New 

 blood-vessels form in loops in the developing lymph and 

 constitute the bright-red granulation-points which cover the 

 raw surface. The fibrous tissue into which the lymph ia 

 transformed iipdei-goes gradual contraction in development, 



