ON THE EARLY STAGES OF INFLAMMATION 239 
of the irritated part, though springing from the same trunk, were remarkably 
encrusted with them from their origin to their minutest ramifications within 
the area, while the capillaries and veins in the same part were similarly affected. 
This striking appearance continued for hours after the chloroform had been 
applied, successive fully formed white corpuscles adhering as they flowed in from 
the trunk, being evidently affected secondarily to the change induced by the 
chloroform in the tissues of the web. 
Thus the affection of the white corpuscles of the blood in an irritated part 
is in all respects strictly parallel to that of the red discs, while the greater adhesive- 
ness of which the former are capable, renders the facts regarding them more 
obvious and unmistakable. 
Being desirous to verify the results derived from the frog by observations 
upon mammalia, in which the aggregation of the red corpuscles assumes a much 
more striking appearance, I examined the wings of two small bats. In the 
first specimen, the corpuscles, both red and white, exhibited decided adhesive- 
ness within the vessels, the web being apparently in a state of irritation from 
injuries which the animal had sustained. In the other there was also some 
adhesiveness in the part that first met my eye, the red discs tending to aggregate 
into rouleaux, and giving a lumpy aspect to the somewhat dark streams in the 
larger vessels: but turning to another place, I found the blood there of pale 
tint and perfectly homogeneous aspect ; nor could I detect by a careful search 
any evidence of a tendency on the part of the white corpuscles to stick to the 
vascular parietes. It happened that there was complete absence of flow in 
one artery and concomitant vein of considerable size, yet not a rouleau was 
to be seen either in them or in any of their branches. On the contrary, the 
red discs lay at about equal distances from each other, uniformly distributed 
throughout the calibre of the vessels; and this state of things remained un- 
changed during about a quarter of an hour, in which I continued to observe 
them in their perfectly quiescent condition. On examination of some blood 
from the heart of this bat shortly after, the red corpuscles exhibited a very 
remarkable degree of adhesiveness, such as I had never seen in human blood,! 
presenting a glaring contrast with their state within the vessels.” 
* The remarkable adhesiveness of the red corpuscles of the blood of this bat, when withdrawn 
from the body, has been particularly described in Section I, p. 213. 
* Mr. Wharton Jones, in the paper before referred to, describes the red discs as aggregating within 
the vessels of the healthy bat’s wing, when their movement is arrested from any cause, in the same 
manner as in blood removed from the body. Vide Med.-Chir. Tvans., loc. cit. I suspect that the pres- 
sure of the plate of thin glass employed in order to bring the necessarily high powers of the microscope 
to bear upon the object is apt to irritate the web and give rise to a degree of congestion, characterized 
by a tendency to aggregation on the part of the red discs and adhesion of the colourless corpuscles to 
the walls of the vessels. I have observed that results of irritation have shown themselves in the web 
