452 INTRO-SUSCEPTION IN A HORSE. 
because it seems to afford some satisfactory explanation of the 
mode of formation of this pathological accident. 
A horse given up to the School by his owner, who had pos- 
sessed him no longer than about six weeks, during which time 
he had worked him hard, on account of presenting all the symp- 
toms of anasarca, and being much reduced in flesh, evinced 
great debility, slight filling of the legs and dependent parts of 
the abdomen, with large petechiae upon the pituitary, conjunc- 
tival, and buccal membranes, and laborious respiration. On the 
24th, some symptoms of cholic and slight tremblings of the 
limbs were observed, the animal often lying down and looking 
at his flank. Notwithstanding the subsidence of the symptoms 
of pain on the 25th, and the notion that the patient was better, 
he died, on the 28th, with all the symptoms of traumatic gan- 
grene. The terminating portion of the loose small intestine was 
found highly congested, and there was an invagination of the 
extremity of the ileum and the commencement of the jejunal 
portion within the terminating part of the jejunum and the 
caecum. At a distance of about nine inches in advance of the 
caecum the jejunum had become swollen, from folding back upon 
itself in the formation of the commencement of the invagina- 
tion. Its tint, in the part which has preserved its normal rela- 
tions, is a bright rose, contrasting remarkably with the deep red 
colour of the intro-suscepted gut. The caecum being cut open, 
exposed a portion of small intestine inverted upon itself, having 
its mucous lining marked with transverse folds, in a high state 
of congestion, which increased as we proceeded downward. This 
part of the invagination was constituted of an intumescence of 
large bulk, resulting from a sero-sanguinal effusion within the 
interstices of the coats of the intestines. This intumescence, 
which resembled the end of the penis in a tumefied state, pre- 
sented in its centre an aperture nearly of a finger’s breadth, 
and which proved to be the terminal orifice of the small intestine 
within the caecum. 
One remarkable fact in this case was the integrity, if so we 
may call it, which the function of digestion preserved, in spite 
of the considerable derangement in the position and structure of 
one of the divisions of the intestinal apparatus ; another, the 
little sympathy created by the intus-susception on the organism. 
The animal fed well up to the eve of his death ; no stoppage of 
the contents of the intestines took place ; a quantity of aliment- 
ary matters was found at the posterior orifice of the small intes- 
tine within the caecum; the dung all along preserved its natu- 
ral character. It has been observed that anasarca frequently 
accompanies asthenic congestions of intestine, accompanied with 
no pain, or next to none. 
