REPRODUOTiVE OVOEE IN’ DASYURUS VlVERRIiVUS. 159 
(a) Progressive Changes. — The mucosa as a whole 
undergoes marked thickening, its vessels enlarge, and in par- 
ticular a rich plexus ot capillaries is established immediately 
below the uterine epithelium. The uterine glands hypertrophy, 
their epithelial cells assume an elongate columnar form and 
secrete actively. 
These changes are identical with those seen in normally preg- 
nant uteri. The only noteworthy difference in the progressive 
alterations in the pseudo- and normal pregnant uterus 
concerns the uterine epithelium, the cells of which in the 
former fail to become transformed into the high columnar 
elements characteristic of the latter. 
(b) Regressive Changes. — The uterine epithelium does 
not appear to be shed as a whole, but undergoes partial de- 
generation and desquamation, and it is noteworthy that 
these degenerative changes may so effect the immediately 
underlying capillaries as to lead to their rupture and the con- 
sequent appearance of extravasated blood in small quantities 
in the uterine cavity. 
We have so far not observed such extravasation in normal 
post-partum uteri, though it is possible that this may occa- 
sionally occur. On the other hand, the very marked extravasa- 
tions into the connective tissue which are found in post-partum 
uteri are not met with in the pseudo-pregnant cases. 
The uterine gland epithelium also appears to undergo a 
process of desquamation — at all events cells are shed from it 
into the gland lumina, where they form cellular masses which 
eventually degenerate. Comparison of our preparations of 
pseudo-pregnant uteri with those of normal post-partum uteri 
demonstrates beyond all possibility of doubt that the regres- 
sive changes in the glands are identical in the two. In post- 
partum uteri, we find the same reduction of the gland epi- 
thelium from the high columnar to the low cubical type taking 
place, and accompanied, as in the pseudo-pregnant uterus, by 
the appearance in the gland lumina, of masses of cells which 
eventually degenerate. 
(c) Regenerative Changes. — The uterine epithelium 
