( «4» ) 
Tubes of the TejiJcles, whofe Cavities arc not more per^ 
ceptablct I am fure the Urine is more affifted in its 
motion by the Dctrufor ^jrzW, &c. than any oi thefe 
Fluids c^n be by the Hearty or ether Mufcles. 
(^) Others- will not admit of an ZJriWj/ Membrane, [^^^^^rth. 
they thinking it would !^e ufelefs, becaufe they imagine, 3(5. §^"7, 
that when the Bladder is full, the Urine muft be dif ^jo^an- 
charged at its Cervix^ and not at its Fundus by the ^ ^g^' 
TJrachus, But in anfwer to this^the Urine can never pafs Parey Lib, 
through the Cervix^ and Urethra^ unlefs the Ahdominal ^^ cap.34. 
Mufcles contraft, becaufe we never void Urine naturally, 
but by the help of thefe Mufcles, nothing lefs being able 
to force open the Sphirr&er Fejicx, Now it being more 
than probable that thefe Mufcles never ad before 
Rejpiration, no Urine can pafs through the SphinBer^ be- 
fore the Child breathes. No reafon can be given why 
the Abdominal Mufcles of a FiBfus, ("hould voluntarily 
contrad, fince neither the Quantity nor Quality of the 
( r ) Urine can excite to fuch an adion. For when the Bmh, 
Bladder is tpo tuU of Urine, it will ouze through the lax Lib.i cap 
fpongy fubftance of the Vrachs, being gently preffed by ^'^^^ 
thQ Detrufor alone. There would arife many ingonve- s.pag. 81. 
niencies from the voluntary contradion of the Abdominal 
Mufcles of a Fcetus, as voiding Fences as well as Drine^ 
into the Amnios, which would be more prejudicial than 
(/) Sweat, &c. Yet if we (hould fuppofe the Abdominal ^^^^^^^^ 
Mufcles of a I'mtus to ad, the Urine will however pafs pag. 5^7, 
where it can moft eafily i.e. through the ZJr^c^//x,which is 
partly open.and altogether of fuch a Texture,as in no wife 
can hinder the palling of the Urine, much lefs be able to 
refift a conGderable force,as the (f) SphinBer Veflc^ can. Be- (t) Gai.dc 
fides, the Vrachus is no^ only thus qualified, for the ad- 
miffion of Urine, but when the Mother lies down, 'tis ^ 
almoft upon a Level with the Urethra^ and what has once 
paflkd the Vrachus^ cannot return by reafon of the 
Length J Situation, and peculiar Strudure of it. Laftly, 
the. 
