r 837 ) 
defcriptions that they never faw one entire. Amongft 
other miftakes f e ) Diemerbroeck fays that the Urine of a 
JBsetHs lies between the Vrimrj Membrane and the Chorion^^ 
as though not contained in a diftind BIadder,but in a Ca- 
vity made partly from t\\^ Chorion^ partly from the I^^-i-f^jdeMui» 
nary Membrane. Org. cap. 
I confefs De ( e) Gr^^/ tells us, that by blowing with 
a Pipe into a Hole made through the Chorion^ all the 
Membranes of the Semndines will appear diftinft. He 
has alfo delineated an AlUmois^ with the other Mem- 
branes, dv. as he fays he tound them. Yet this (/)F%, f^^^p 
muft have been drawn from his own fancy, and not Tab, aad. 
from any preparation, for thefe reafons. ift^ Becaufe, 
by this way of feparation, you can only part the Allantois 
from the C/6mV«, but never fee its true dimenfions^ nor 
any appearance of a Bladder 5 for a Bladder, as th^ Allan- 
tois is, can be fhew'd only by blowing into its Cavity, 
or by finding it full. Yet in this Fig. no fign can be obfer- 
ved, where 'twas blown up, and tied, De Graaf alfo 
fpeaking of making a Hole only in the Chorion. Nor can 
this Allantois be fuppofed full of Urine, becaufe 'tis not 
of the Shape of a iuW Allantois, and our Author himfelf 
calls it only the inflated part of the Allantois. However, 
I can't conceive how the Allantois could remain partly 
filled with Air f any more than it might with Urine ) fo 
long as till this Fig. was drawn, unlefs fome Hole was 
tied up, whence the Urine came forth, and the Air was 
blown in. 2dly, Becaufe in this Fig. the Dmhilical Rope 
feems to run through both Amnios,, and the Allantois^ to 
its infertion on the Placenta. Whereas the Allantois is no 
where perforated by the Umbilical Rope^ nor does it any 
where pafs through ihQ Amnio s.hwt only runs under it,at the 
place of its infertion on the Placenta^ If the Navel- firing 
could be allowed to enter the Amnios at ^g) I, and to/^j . 
pafs under it to the Placenta^ why ftiould it not appear 2 2d De' 
( which it does not ) under the Amnios^ as well as theG'^»«f^ > 
R r r r r 2 thin 
