C +78 ] 
The fepfum was not merely •membranous, but 
fiefhy, and of a confiderable thicknefs ; and, like 
mod other inedicjli'na V\ .he human body, confided 
-of -two lamina combined. Of thefe . each vagina 
furnifhed one ; for each had its o v confdidlor, and, 
being completely furrounded by mufc.Hr fibres, 
had a power of contraction independent on the 
other ; which could not be effected if both va- 
gina were comprehended within the fame mufcular 
rings, and feparated by a membrane incapable of 
aftion. 
It has been the opinion of many modern authors 
of the firft reputation, that th z fundus is that part cf 
the womb, whofe extent increafes, in the greateft 
proportion, during pregnancy j and upon this fup- 
pofition, they have founded various theories. One 
of the principal arguments which they propofe, in 
fupport of their opinion, is, that the infertion of the 
fallopian tubes is removed from the angles of the 
uterus and gradually defcends towards its neck, fo 
that a fhort time before delivery they are at a very 
great diflance from their former pofition. haller 
does not attempt to deny thefe fads j but mentions 
three inflances where the tubes did not change their 
place. But petit, in his Memoire on the caufe 
and mechanifm of child-birth, is clearly of opi- 
nion, that the whole dodrine is deflitute of foun- 
dation. He aiTerts, that the fundus increafes lefs 
than any other part, and that the furpriling growth 
of the womb is effeCled by frefh fupplies of fibres, 
fucceffively furnifhed by the neck and parts ad- 
joining. As a decifive proof, he infills, that the 
infertion of the tubes continues nearly in the fame 
place, and accounts for the error of the abovemen- 
• tioned 
