an uidor or scrctua, and tne latter would fee a strong criterion of 
alanesa. Roller no londler (*3 5) state incidentally that they 
have note; codifications of the external genital! in tfc nalo 
direction, but they do not caccribo there. A c* & is described 
and interpreted as abuorml rale by Pa.nucBon (*10) of a foetus 
twin to a nerval bull calf, which hid no prance, aero tire, vulva, 
vagina, developed cervix, fallopian tabes or hydratid, id no 
prostates, but which had a hert hidden onic in the urethra, on 
udder ana teats, a uterus with horns and holy, spinal vesicles 
viui ieforeos# epididymis, an. partially descended gonad* fith 
these few possible exception*, the ferule Is aodifisd in a re- 
xrk&bly definite and lisitiKi manner, so that her internal genital 
organs are cede over in the scale direction, on her external ones 
rsaain distinctively ferule. 
as to the cuu o of this resorbable situation, Lillie (*lt,Vl7), 
in America, and Keller and Tend1 st ( 1 3 ) in iuropo, ^uitc iado- 
penior.tly, <Arrive.; at the s&r-e conclusion that tho fro<.-martin 
ccoditi-n is due to the action of a aul© boraoro, free the ale 
co-twin, passin. by vascular an^stoaoei o' the placental vaeaelr, 
to the fo ale, which causes -odification ofthe internal go.orutivo 
or : uns of such fo als in the r direction, without in any way 
interfering with the norm! development of too t?alo co-twin. 'taller 
arid Tangier d rot *y where they think t> e hersone is produced 
nor nr.sr it begic.s t act* hix:io (*1?) postulates that since tne 
interstitial colic of the ~aa*ral testis develop lor. bo for thone 
of the- ovary, the, re protahly the vat o'* ale nortaono production* 
Lillio arri Ha co (* f) and Baseon (*2 ) chow that the interstitial 
calls of norml -.tie cattle c'bryos appear bet»*e • ?*’ f att 3*0 ca, 
stators, wh eb i about the tisw of the initiation of external rexaal 
