CilAP, I. 
THE DESCENT OE MAN. 
31 
ha ei ^ ance > namely, on parts acquired by one sex 
}Xen P artia % transmitted to the other. Here 
is '! 1 1 . 0nl J r g ive s °me instances of such rudiments. It 
clud" 3 ^ novvn that in the males of all mammals, in- 
S( . ln § nmn, rudimentary mammas exist. These in 
vi'lDi lnstances have become well developed, and have 
tit • a co f ,ious su PP ] y milk. Their essential iden- 
y nr the two sexes is likewise shewn by their occa- 
atf s y m pathctic enlargement in both during an 
ha-sl °f the measles. The vesicula prostatica, which 
een observed in many male mammals, is now uni- 
^eisally acknowledged to be the liomologuc of the 
j g ftla e nterus, together with the connected passage. It 
J^-ble to read Leuckart’s able description of this 
0 f\ an> ant * bis reasoning, without admitting the justness 
tho ^ conc bision. This is especially clear in the case of 
cates D J am “ als in which the true female uterus bifur- 
h>it'ivr 5 01 J U tb* 3 males of these the vesicula likewise 
bel 1CatGS ' 42 ^°me additional rudimentary structures 
u. n >= ln o to the reproductive system might here have 
een adduced. 43 
e . bearing of the three great classes of facts now 
full ^ 1S UnniI stakeable. But it would be superfluous here 
in I le *' a I a tulrtte the line of argument given in detail 
of the °b Species.’ The homological construction 
inteir "i' l0 ^ e frame in the members of the same class is 
p r S'ole, if we admit their descent from a common 
to to g e tbe.r with their subsequent adaptation 
larit 1Ve , rs b‘ ec ^ conditions. On any other view the simi- 
3" o pattern between the hand of a man or monkey, 
hx l a«rtt!S rt ’ r l“ T T, ? dd ’ s ,‘ Cyclop. of Aliat :’ 1849 ' 52 > iv- [>. Min. 
" 1 ttany other i ' ' 
this • - i r - — — • - 
80 many other ru p 13 0n,y from tbree to six lines in length, but, like 
88 'a other char ( ,! mentar y parts, it is variable in development as well 
See ■ a " 
(176, 7QQ tlds sub ject, Owen, ‘Anatomy of Vertebrates,’ vol. 
iii. pp. 
