154 ON THE STATE OF THE BLOOD AND 
lating collyria, applied to the eye, for the cure of inflammation 
of the conjunctiva.” 
Section 4 . — Slate of the Blood and the Bloodvessels when 
Resolution of the Inflammation of the Frogs Web , excited by 
the application of a strong Solution of Salt, does not take place, 
but when a part of the Web mortifies . — In the mortified part 
there is no appearance of blood and bloodvessels, while the 
bloodvessels in the web generally are in the same state as when 
a piece is cut away, instead of being destroyed by mortification. 
After the separation of the slough, during the process of 
granulation and cicatrization, the blood in the vessels at the ex- 
treme edge of the capillary network is found to continue 
stagnant. 
CHAPTER VII . — An Attempt to apply what we have learned 
from Observations and Experiments on the Frog, respecting 
the State of the Blood and the Bloodvessels in an inflamed 
Part, to the Elucidation of the State of the Blood and the 
Bloodvessels in an inflamed Part in Man. 
Section 1 . — Of the State of the Blood and the Bloodvessels 
in Inflammation in Man . — Direct observation leads to the con- 
clusion, that the distribution of the smallest arteries of the 
capillaries, and of the smallest veins in man, is essentially 
similar to their distribution in the web of the frog ; that these 
same vessels are identical in structure and function in the two ; 
and, moreover, that there is also a close resemblance in the 
comportment of the blood corpuscles to each other, and to the 
vessels in man and the frog. 
“ The vascular injection of the inflamed conjunctiva,” says 
Mr. Jones, “ as observed with the naked eye, or by means of a 
magnifying glass, presents the same characters as the vascular 
injection in inflammation of the web of the frog as observed by 
the same means. Seeing this, and also that the plan of distri- 
bution of the small vessels is similar, and knowing that the red 
corpuscles of the blood of man aggregate together much more 
readily than those of the frog, Mr. Jones argues that we may 
fairly conclude, that, in the vessels of an inflamed part in man, 
the red corpuscles of the blood are accumulated and aggregated 
together in a similar manner, though to a greater degree, to 
what we can directly observe in the frog. With reference to 
inflammatory injection in man, the result of the operation of 
cold, Mr. Jones observes, that the direct action of cold produces 
constriction of the small arteries of a part, and, as a consequence, 
congestion, or a sluggish flow of blood in the capillaries and 
veins, with here and there stagnation. “ The bluish redness 
