56 PATHOLOGY. 



tion of new cells witliin the parent cell — endogenous growth. 

 The multiplication by simple division is the most frequent 

 method. The cell divides and forms two cells, each of which 

 divides again and forms two more, and so on. In nucleated cells 

 the nucleus generally divides first. 



In multiplication by budding, a small portion of the germinal 

 matter projects from the cell, and becomes detached by constric- 

 tion at its base, and forms a new cell. 



Endogenous multiplication occurs in cells with an indurated 

 outer layer — dense cell wall — as in some varieties of epithelium. 

 The germinal matter divides within the membrane, and forms a 

 number of new cells. We have thus a parent cell enclosing a 

 brood of young cells, of necessity smaller than the parent cell, 

 which are subsequently hberated by solution of the parent cell 

 wall, or escape by their own inherent power of movement. 



Nutrition may then be said to be dependent on two things : — 

 1st. Upon a due supply of plasma; and 2d. Upon the appro- 

 priation and elaboration of the plasma by the cellular elements 

 having vital properties, and possessing within thenaselves the 

 powers of growth and reproduction. 



Wlien nutrition becomes absolutely arrested, death of the 

 part where such arrestment occurs is the consequence. When 

 the arrest of nutrition is general, the whole body dies ; when it 

 is local, gangrene or necrosis is the result. These two latter 

 conditions having been already described in my work on Veteri- 

 nary Surgery, I will pass on to those morbid conditions which 

 are dependent on impairment of nutrition, namely, Atropliy and 

 Degenerations. 



