gross discretion, and in later stages they appear on an inter¬ 
rupted Wolffian duct* and* in rany cases, on isolated parts of it, 
and always farther forward than in mice of like aise. I the 
laat stage studied they are found in the lateral wa lfi of the 
cervix uteri and anterior part of the vagina. The number o* minute 
vesicles is a sex oh raoterietic. 
Tft stolon usually one, or at ~o*t two, occur, of which the 
posterior one dooc not develop, while the anterior one on each 
aide grows strongly to a considerable length before branching and 
the opening of its single duct in later stages is progressively 
nearer the posterior end of the Tol^fiao duct, into wh eh it crens« 
The large also and preface branching of the single seminal vesicle 
on each side, in the male, is & striking characteristic of the sex. 
In free-^ariins the condition as regards s?Rinal vesicles 
ie varied. All appear to have developed as females with coae inhibi¬ 
tion of the vesicle growth, followed by increased stimulation, 
which causes increased else, like that in the sale, but with increased 
number as in the female, or even more, e, g.,tha gO,D cm. fres- 
aartin with 11 diverticula on each side. This is again a case of 
a male typo of development, imposed upon & sot of female pricordia, 
the degree of which &pp ara to be a function cf the time of incep¬ 
tion of the mis feormene, a&i the time elapsed from inception to 
the stage studied• 
($) There appears tc fee a sexual difference in the rate of 
growth of the Pierian ducts in stages that appear to be sexually 
Indifferent externally. In females the Hfcllerian ducts re ch tho 
sinus earlier time in males, and as this occurs in tho female, at 
least, before either sex has interstitial cells, it is believed to 
be xygotioally controlled. 
(?) In females the *s&llorian ducts centime tc develop into 
the cstium, fallopian tubes, cornua uteri, corpus uteri, cervix start, 
and vagina, and reaain continuous and patent throughout. The 
retrbat of the gonad and the altered proportions of the pelvic 
