458 
THOMAS BOWHILL. 
fourteen in length, were seen to be attached to these indentec 
localities, the papilla of the parasite extending into an infundi 
bulifom opening in the mucosa, which in all probability corre 
sponded to the mouth of a gland or follicle, around which tlu 
tissues were swollen and indurated in a sharply circumscribec 
manner. Many of these places were the seat of more or les 
haemorrhage; in others, which the worm had apparently left 
was to be seen an umbus, or circle of greyish yellow color, upoi 
which lay, and was attached a black mass of about the size of : 
segment of a small pea. In the middle of the mass was a smal 
pit or indentation which corresponded to the place where th 
worm had been attached. In some cases this black mass was i 
a process of exfoliation. These objects have the strongest, i 
not an exact resemblance to those often seen in the large ir 
testine in swine plague, and might lead an uninitiated, unol 
servant and non-reflecting person to look upon a case of sitnpl 
pneumonia in a number of a herd of hogs in which he shouL 
observe and feel the above lesions, without at the same time mat 
ing a careful examination of the contents of the intestine, o 
especially if the worms should be absent, as in cases of swin 
plague; but an examination of the other organs, especially tli 
lymph glands, and above all a microscopic examination for bach 
ria, would soon correct the hypothesis. It should, however, b 
mentioned that another essential point in the differential diag 
nosis between these objects and the neoplastic growth in the larg 
intestines on some plague, is the tendency to, or actual penetrt! 
tion of the walls of the intestine which occurs in the former an 
not in the latter. This experience goes to show that neoplasb 
and necrotic products of this circumscribed character are nc 
peculiar to swine plague, and in either case are due to parasit 
irritation, but it should not be forgotten that those due to tl. 
ascaridae are invariably situated in the small and not the larg 
intestine. Dr. Cobbold in his work on entozoa describes th 
parasite as “ ascaris suilla.’ 1 He says “ it is closely related to tl. 
ascaris lumbricoides of the horse, and by some thought to be tl 
same. Their habitat is the small intestine, sometimes found i 
the stomach; they perforate the intestine, and have been know 
