208 ON THE NATURE AND PRINCIPLES OF 



explicable by, and the result of, this physical 

 process. 



Another occasional effect of determination of 

 blood is hemorrhage, from the rupture of some of 

 the distended arteries. This is of course most likely 

 to occur when the arterial coats are diseased, or 

 when the disorder affects vessels which are naturally 

 weak ; as in the brain. 



But determination of blood sometimes produces a 

 third effect, namely, the hypertrophy of the part 

 thus unduly supplied. As we are at present merely 

 inquiring into the nature, causation, and mode of 

 operation of that disorder of the circulation, I cannot 

 here enter upon the consideration of the circum- 

 stances which distinguish physiological from pa- 

 thological hypertrophy. It may be sufficient to 

 observe, that the physico-vital condition present, is 

 in both cases the same. It is, however, necessary 

 to mention the distinctions between hypertrophy 

 and inflammation, as induced by determination of 

 blood. These two states differ 1. In the relative 

 intensity and duration of their immediate cause. 

 Hypertrophy is the result of a slow, gradual, and 

 continued increase in the supply of blood to a par- 

 ticular part, while a sudden and considerable incrcu-e 

 in the influx of blood gives rise to the phenomena of 

 inflammation. 2. The condition of the vessels of 

 the aftected part varies in the two cases. When 

 determination of blood ends in inflammation, there. 

 is a considerable disproportion between the aggregate 

 area of the capillaries of the aftected part and that 

 of the arteries supplying them ; the former being in a 



