only take off the edge of the Aeid, but by its rough 
and (harp parts breaks the Vikofity of the Animal Li- 
quors. 
EjufJem Difertatio Academic a An Paffioni 
lliacdt Globuti flumhei H)drarg^YO Prefmnc/i. 
Monfp. i6p^* in 12^ 
THe defcent of the Chyle and F(^ces thro the Guts, 
is owing to the Contraftion ot their Annular and 
Longitudinal Fibres, When the Aliment is firft re- 
ceived in the Dnademm, tliQ Annular Fibres contiguous 
to the Pj//<?r^ being irritated comprefs the Mafs. This 
cannot recede into the Stomach by reafon of the val- 
vular if ufture of its lower orifice, and therefore it is 
protruded into that open part of the Duodennm n^xt 
belovv. Now the Annual Fibres of the receiving part 
conftringing themfelves before the contraction of the 
former remits, there is lefs refiftance beneath than in 
the fuperiour part, and therefore by this Tenfion the 
Mafs is conveyed downwards. By a fucceflive con- 
tradion of thefe Fibres after the manner defcribed, its 
progrefs through the whole length of the Tube is ef- 
fefted. Befides this, v/hile the Annular are thus con- 
traded, the Longitudinal Fibres fufferagreatdiftenfion, 
and therefore in their turn, either by their Elafticity or 
the Influx of the Spirits, they contraft themfelves, which 
fliortens the Duft, ' and affifts the motion of the Con- 
tents thro it. 
From the nature of this Vermicular motion it ap^ 
pears when any obftruftion fhall happen by the Con^ 
ftruftion of the Inteftinal Tube, the Chylaccous Mat! 
muft receive a new direftion. In a Natural Order it 
is determined downwards, by reafon of the Impedi- 
ment at the Mouth of the Pylorus 5 on the contrary 
therefore when the Impediment lliall happen to be 
greater 
