[ 77 . 3 . 
count the vermicular Motion in the Guts; but- this 
Motion is not begun, till there is a Neceflity for it ; 
which is as foon as an Ovum is impregnated. 
XVI, 
At the Inftant that this Impregnation happens, the 
Orifice of the Fallopian Tube clafps itfelf clofe upon 
the Part of the Ovarium next to it, by contracting ; and 
receives into it the Ovum\ which, as foon as it has en- 
ter’d, thofe oblique circular Fibres, or, as we may term 
the Extremiry, the SphinEler of the Tube, inclofes and 
pufbes it farther in towards the Uterus , which is by de- 
grees forwarded by the per iftaltic Motion of the Tube, 
till at length it is pufh’d into its Receptacle the Uterus , 
in the Manner explained in my laft LeCture, where I 
endeavoured to account for involuntary Motion : 
And when the Ovum is thus fettled, then the Caufe 
of this Motion ceafing, the Tube is at Reft ; and in 
proportion as the Uterus grows more tumid after- 
wards, both Tubes lofe their vermicular Flexures, 
and at laft grow quite ftrait and pendulous, as at 
Tab. Ill, bb 7 by the general Diftenfion of the CPm- 
tonaum : But when the Uterus is emptied, and again 
is contracted to its former Dimenfions, then the Du- 
plicature of the Feritonaum is contracted in propor- 
tion, and thefe Tubes are confequently reftored to 
their former vermicular Flexures, and therefore ren- 
dered capable of receiving an impregnated Ovum , as 
before. 
XVII. 
From hence it is eafy to conclude, that what has 
been thought, by many old Authors, and indeed by. 
feme 
