268 ON THE PATHOLOGICAL MORPHOLOGY OF SOME ANIMAL FLUIDS. 



the blood in any circumscribed place, we observe to precede exudation 

 and hepatization. * An inflammatory tumour from exudated plastic lymph 

 takes place, redness from the dilated passage of the adjacent interme- 

 diate vessels, in which there is contained a greater abundance of blood 

 which regurgitates from some obliterated intermediate vessels ; pulsation 

 in the inflamed texture then presents itself, whenever a new wave of 

 blood is impelled towards the obliterated intermediate vessels, and 

 hence arises also the dilatation of the adjacent intermediate vessels.* 

 The impediments of the circulation in the intermediate vessels sensibly 

 retard also the circulation in the capillary vessels resisting the expan- 

 sion, until either they overcome the obstacle, or their tonicity being 

 weakened, they also suffer dilatation ; and in the same manner the 

 smaller and larger vessels, and lastly the heart itself, on account of the 

 impediment of the circulation, produces more vehement and quicker ex- 

 pulsions of blood, exciting an universal fever. Hence, or in this way 

 is explained the diversity of the pulse, the pectoral pulse in pneumonia, 

 because the left heart impels the blood into the aorta without any ob- 

 stacle ; the cephalic pulse, if the obstacle is in the circulation of the 

 carotids, in a direct line impeding the expulsion of the blood ; and the 

 abdominal pulse, if the obstacle of the circuit of the blood has extended 

 much into the mesenteric vessels, it flows back into the abdominal aorta, 

 and thus is the impediment of expulsion r placed in the left heart 

 itself. It is thus that the free pulse, after venesection, is to be ex- 

 plained. 



The liquor sanguinis quickly transudes the walls of the intermediate 

 vessels, quickly rendered thin by dilatation; it separates into serum and 

 plastic lymph ; the plastic lymph, again, forms into molecules and soft fi- 

 brils, forming, by an organic molecular attraction, globules which we find 

 enclosed between the fibres. Hence an inflammatory boundary 



1. From the texture of the pathological substratum. 



2. obliterated intermediate vessels. 



* It may be here stated, that the author's description of the smaller vessels is in 

 accordance with the arrangement of Berres. Berres divides the vessels running be- 

 tween the larger arteries and veins (proceeding in the order of the circulation), into 

 arterial capillaries, intermediate vessels (capillaries of English anatomists), of equal 

 diameter throught their course, and venous capillaries. Most English, and French, 

 and even German writers, on the contrary, call all vessels which gradually decrease 

 in size, arteries or veins, according to whichever system they belong ; while they 

 confine the term capillaries to those intermediate vessels whose diameter is the same 

 throughout their course. Translator. 



