( »3» )s 
thin fubftance of the Allantois ? Againjaccording to De 
Graafs pofition of the Secur^dhies, (which is the reverfe 
of Fig, I ft, where the Navel- firing lies nnder the AlUmois") 
^ nothing could hinder a plain view of the place where 
the Navel'flriKg is fet on to the Placenta. This will be 
eafily apprehended, by fuppoling the partHjn my ift 
Fig. ro lie uppermoft- the Fundus G and JSJavehftrings 
being tarned over 3 for then the Strings will run over 
the Allantois, as in De Graaf s Cur, and its inferrion ap- 
pear plain on the PLuenta^whkh yet can't be difcovered 
in his(^) Fig. I am fure the whole is irregnkr, and I 
take it to be fiftitious, M for the Z)rinarj (g') Mcm- 
Tab '^^d^'^^^^^ Git feems to the Allantois oi a Colt f where (A) 
* ^ ■ Needham fays, the Vn/bilkal Rope runs through the Vri- 
vary Membrane) not kfs abfurdly added to the Secnndines 
^ ' of a Humane Fe^tus than the Secnndines ol a W/jcl^ are to 
a like Fietns by Vef alius. 
Laftly, Tis raoft evident thatDe Graaf knew nothing 
of the true Shape of this Membrane, and that he had ne- 
CODe Gra. ^'^^ fcen one entire, becaufe he confents to (/J Need- 
15- ham% defcription of it as true,which yet is falfe in feve- 
defo*rmar ^^^ particulars. For ift- the TJrinary Membrane does not 
^cet, cover the whole f f as he affirms j but only that part 
of it, which refpefts the Charion^ and does not lie on the 
Placenta ^ for the Allantois can be extended at fartheft 
but to the edges of the Placentx, where the Amnios and 
Chorion are fo clofely joined by Frhrer, that no Mem- 
brane can come between them. Wherefore sdly, the 
r.he Allantois is not every where faftned to the Chorion. 
And confequently gdly , rhe Allantois can't be of the 
fame Shape tliat the other Membranes are of, nor be like 
tht Allantois of a G?//,which contains the Fcetnrm th^Am- 
'A)ca til ^'^-^ 5 Ml which neverthelefs Needhanz a&vts. In 
"^'^ fhort, Dr Needham had feen only pieces of the Urinary 
Membrane, but never an entire one, and fo could only 
gutfs at the Shape, &c, of it^ from what he had ob- 
ferved 
