( <8 3^ ) 
opportunities : For the accounts the Antients have left 
of many parts, particularly of the Vrachus and AlUntois^ 
(as to. its Name, iFigure, Site, &c^) agree only to their 
appearance in Brutes. I (hall fay nothing ot the Allantois 
in Brutes, fince it is granted by moft Anatomifts, to be 
in thefe Animals, and ftifficiently defcribed by Dr 
This excellent Anatomift alfo firft difcovered part of 
the Allaf7tois in Humane fubjefts, bur neither he, nor any 
other, has taken the right method of finding it entire,and 
'tis no wonder they could not,truly defcribe what they 
^^p^^ never fa w. Q) Dr Needham kys, that after the Amnios 
7tb. is cleared, and left fixed to the Umbilical Rope^ you may 
divide by the fingers, or knife, the remaining part of the 
Involuera into two Membranes. The exterior he truly 
calls the Chorion^ the interior he takes to be the Allantois. 
But by thefe ways of feparation, you will prefently tear 
the Allantois^SLXid be able to difcern only fome fmall pieces 
of it. Befides, the i^//^»/^?^/ is at firft fight, fb like the 
Amnios, that ( e) many who fuppofe the Amnios double, 
iI: i'^«p!^nd that its Coats are eafily feparable, have taken thefe 
31. Horn, pieces of the for broken parts of one of the 
^^^^^'^9' Co2iisoit\\Q Amnios. Whereas having firft found the 
Bole whence the Urine came forth ( if the Allantois is 
not too much torn ) you may blow up the Allantois with 
a Pipe to its full dimenfions, and then fee its true Shape, 
the Fundus.the Crevix, the infertion there of theVractu^r^ 
its relation to the other Membranes,d^<:. Pe the Allantois 
never fo much torn, yet this way you may eafily feparate 
many Inches of it, from the Chorion^ and Amnios^ Which 
eafie feparation demonftrates a diflan^tion of Membranes, 
fince no double Membrane can be di vided by the breath 
alone. 
id) Li ift Ifideed Hohoken and ( d') Diemerbroeck make it a very 
cap. 3*1! eafie thing to feparate the Allantois from the other Mem- 
branes, only by the fingers 5 but 'tis plain from their 
, de- 
