PRESIDENTIAL ADDRESS. 101 
to a developmental anomaly, the outgrowths from the primi- 
tive intestine intended to form the solid liver having failed 
to do so completely, leaving cystic spaces resembling intes- 
tinal tissue. This view is supported by the presence of a 
narrow muscularis mucose in the walls of the cysts, which 
are lined by very tall, narrow, degenerated cells in places. 
Villous-like projections, one into each of several cysts, were 
also noted, perhaps representing the intestinal vill. 
Chronic Abscess of the Spleen.—In a specimen of E. nor- 
vegicus examined on July 6th, 1910, the spleen was greatly 
enlarged (17 grms., the whole rat weighing 381 grms.), 
and contained a large chronic cheesy abscess at one point, 
and a few smaller ones scattered throughout the rest of 
the organ. ‘ 
Cheesy Abscesses of the Iwer.—These were present in a 
common mouse submitted on May 26th, 1909. 
Decomposing Fatuses wn Uterine Cornua—A Norway 
rat, examined on April 8th, 1909. had one horn of the 
uterus distended with a foul-smelling fluid containing two 
macerating foetuses. A specimen of EF. rattus, submitted 
on July 9th, 1909, had a mass, the size of a marble and at- 
tached to one uterine cornu, distended with a foul-smelling 
mass, probably due to a retained feetus. 
Abscesses of Both Ovaries.—In a Norway rat, on March 
28th, 1912, abscesses, one the size of a small mandarin 
orange, were present in both ovaries. 
Extra-Uterine Fetation (?).—In a specimen of E. rat- 
tus, on February 2nd, 1910, a mass the size of a walnut 
was found behind the uterus at the junction of one horn. 
It contained fcetal remains, and was due either to an extra- 
uterine fcetation or the rupture of one horn. 
Miliary Nodules in the Peritoneum and Abdominal Mus- 
cles.—In these situations, in a specimen of EH. norvegicus 
