90 
A PECULIAR AFFECTION IN THE HORSE. 
of the aorta, there was a canal through the central part of nearly 
one inch in diameter, filled with bloody spume, through which 
flowed a small stream of aqueous fluid : in this state they repre- 
sented a perfect vessel situated in the interior of another, through 
which the circulation was effected. 
The Organization of the Clots of Bloocl . — When considered in 
a general point of view, and throughout the whole of the circula- 
tory system, the clots of blood presented themselves under three 
different forms : — 
1st, In the form of a jelly, slightly elastic; of a brownish hue, 
when seen by a refracted light, and having a shade of green on the 
surface. The jugulars are illustrations of this. 
2d, Under the appearance of a tough, grey, stringy matter, 
covered here and there with blackish spots, of a more or less deep 
hue, produced by the hemorrhoids being only imperfectly re- 
absorbed ( vena-porta ). 
3d, In the form of hard masses or concretions, of a blackish 
colour, elastic, and full of fibres (the posterior vena cava). 
With respect to their texture, the fibrinous concretions comprised 
under the third class may be subdivided into three sorts : — 
The first comprises those formed by successive layers from the 
circumference to the centre, (see the vena cava and mesenteric 
veins). 
The second, the formation of which took place from the centre, 
and was continued externally to the circumference. 
In the third were ranged the concretions resulting from the 
intermingling of the fibres, of which they were composed in every 
direction (splenitic hepatic lateral artery of the canon). 
The clots of blood comprised in the two first classes are very 
similar, in point of structure, to those which are found in the jugu- 
lar, at the extremity of a thrombus or its ligature. Like them, 
they are formed of a succession of thin circular layers, fitting one 
into another, in the central part of several of the clots of blood. 
When viewed lengthways, they presented continuous lines, the 
ends of which were interlaced. 
Here terminates a very incomplete description of this curious 
alteration of the blood — curious in a triple sense of the word — as 
respects the study of the symptoms furnished by the blood, the 
morbid lesions produced, and the consequences which resulted 
from them. I say incomplete, because our readers will easily 
perceive that there are two things wanting which ought not to 
have been omitted, and without which the interests of science and 
of truth are not supported. Our minds being fully pre-occupied by 
the alterations and lesions which a long and scrupulous ex- 
amination revealed to us, we forgot to give the attention to 
