(^47) 
Bladder, . or Membrane, undQt tho .^lUfitois^ and perhaps 
it may be fo: but I think it difingenuons to conceal what 
I did obferve, or to make out by fancyj, what I coiuin't 
difcover in fad. 
Others have thought this AlLwtois to be an Ar./mos of 
one of the Tvpins beloliidng to th-^fe Sccundines. This Ob- 
]Q&ion^ though it rmy fteiii plaufible, yet iS' of no iorce. 
For ift, this Allamois Isxmdi finer to tae coueh^ and 31- 
fo much more franfpareatj than the other Amntos 5 which 
ftill remains fliff, whilft the much thinner J//^.v^£?;> finks 
upon the leaft blaft of Air, notv/irhftanding the itilcs !. I 
which afiift it. sdiy, This AlUntois 'mA two vifibie 
%)rachu/s^ and it is of an Oviform Figure, fomevvhat iike 
the common Cuts of a Mans Bladder ( for a true Cut ot 
a BHmane Bladder F never yet faw, for Jt ought to be 
made much bigger ( as it really iS J at its Crevlx^ &c. ) 
Alfo this J/Z^/^^V/ no where touches the P/^^^e.^^^^, unlefs 
at the Ner^ F. But on thecantrarv, th^ Amnios is of the 
lame irregular Figure, as the Pofition, Motion, &c. of 
the F^/z/j- require. Like wife, it covers the whole in rer« 
nal forface of the Placenta^ jdly, They who make this 
Objedion muft fuppofe fome Hole in this Bladder, and in 
the Amnios^ through which one Umbilkal Rope may pafs 
from the Placenta to tho Bktur, But f^jch a Foramen 
would be preternatural 5 becaufe the Nam l- firing only 
runs from the Place fit a to the F{Etm^ under a Coat taken 
from the Amnios^ and lyes with the Fcetus in the C^viry 
of the Amitios^ that is no where perforated. 4thly- T- ^.e 
Hole at tiie Fundm G wks fcarcely wide enough to re* 
ceive the end of a mans finger, whereas the Ixvlns did 
not want fix weeks of their full timee. Since rher. lore a 
Fmtus of near eight months could not poffibly pafi iLis 
Orifice J this Bladder could not be an Ammos. 
fslorhing in thele Secnndines is preternatural C!ily 
fome things were not before obferved. Hicherto Ai.i- 
toniifts have not allowed Twins to lye in a common Am 
