DISOSE AND ITS EFFECTS. 47 
by sheep, deer, oxen, monkeys, goats, and occasionally 
in man. 
In mammals the oviducts become transformed into a 
complex uterus. Other ducts belonging to the Wolffian 
bodies are modified in a similar way, serving to convey 
the products of the male 
generative gland to the ex- 
terior. 
It is somewhat remark- 
able that each vertebrate 
embryo possesses male and 
female reproductive ducts ; 
the adult male of most verte- 
brates possesses vestiges of 
the female ducts, whilst the 
adult female possesses, much 
more constantly, easily de- 
tected remnants of the male 
sperm-ducts. Remembering 
that the primitive renal 
organs are common to both Pete the “male renredaenne 
sexes, and as the disused organs of a Skate, with a fully- 
ureters have been utilized ees ewe ; = 
in the male and female for — epididymis (after J. D. Matthews) ; 
reproductive purposes, it ren- nes 
ders their temporary co-existence in the embryo, and the 
persistence of one or other-in a vestigial form accord- 
ing to the sex, comprehensible without invoking aid 
from the much-disputed question of the existence of 
a condition of primitive hermaphrodism. 
The history of the reproductive ducts in the female 
Ny" 
