154 
J. P. HILJ. AND CHAS. H. o’dONOGHUP. 
The most striking changes during this period, howev^er, 
occur in the mammary glands. These changes have already 
been fully described ( 20 ), so that here it is only necessary to 
emphasise the fact that the glands hypertrophy in precisely 
the same way as do those of the pregnant animal, and ulti- 
mately reach a state of development, which is at least as 
advanced as that in a female thirty-six hours after the birth 
of the young. 
Uterine Changes. 
Case 1 (31 . V . ’01). — This female died in captivity the day 
after its arrival. The uteri were slightly enlarged, but no ova 
were found. Examination of the ovaries reveals the presence 
of corpora lutea in the last stages of growth, there being 
present in their central region small spaces not yet filled 
either by lutein cells or by connective tissue. Ovulation must 
have occurred some days' previously. 
The uterine mucosa measures 2-3 mm. in maximum thick- 
ness. The uterine epithelium ("027 mm. thick) is foi'med of 
narrow columnar cells with closely packed small nuclei, ovalish 
or rounded in form, occupying the mid-region of the layei’. 
The uterine glands appear crowded together and are markedly 
convoluted. The connective tissue is compact below the 
epithelium and fairly so between the glands. The mucosa is 
not specially vascular. 
This case is of importance as showing the condition of 
the uterus in a female some time after ovulation and before the 
onset of the degenerative and regenerative changes in the 
mucosa. 
Our next two cases are of special interest as showing stages 
in these degenerative and regenerative changes in the non- 
pregnant uterus after ovulation, changes which we are 
convinced are the homologuesof those seen in the normal post- 
partum uterus. 
Of Cases 2 and 3 we have no further record beyond the 
statement that the uteri were opened but nothing was found. 
