( ) 
clofe'y witli the watery Fluid, may quickly be drawn . 
ot from the Blood. The.Corpufcles which are lioweft ^ 
in uniting, muft be fucli as have the v^eakdl attradive 
Forces which by his 2d Prop, are fuch as have the lealK 
Solidity, but their Surfaces mod: extended ; and there- 
fore Corpufcles, which have plain Surlaces, are longer . 
in uniting than the Spherical ones , but when united,' 
they cohere-mod ftrongly^by his 9th Prop, and compofe 
the mod vifeid Fluids: Such are the Mucilages ol the 
Joints, which are leparated at the greated diltance from 
the Heart. 
Tho’ the Secretion of the Gall by the Liver, and of 
the Seed by the Tedicks, may feem to be confideraWe 
Ob)e6Pions againd this Dodrine, yet there is I'^ally no^ 
thing that more illudrates and. confirms it than the 
manner of forming thefe Secretions. Had the Blood 
been immediately convey’d by the Celiack Artery to 
the Liver, it is evident, thi# on the account ol the 
iiearnefs to the Heart, and the Intedine motion of the 
Blood, that-fo vifeid a Secretion, as the Gall is, could 
never have had time to have been formed in the Blood, 
and fecerned in that place ; and therefore here feature is 
ibreed to change her condant Courle of fending Blood i 
to all 'Parts by the Arteries, and forms a Vein, by ' 
M'hich the Blood is derived t0 4 :he Liver from the Bran-^ - 
dies of the Mefenterick and Geliack Arteries, after d 
has palTed through ali the Intedines, Stomach, Spleen, 
Caul, and Pancreas. By tins extraordinary contrivance, 
the tilood is brought a great way about, before it arrives 
at the Liver ; and its Velocity being extrcamly dimi- 
niih'd, the Corpufciilcs will have time to unite and Ibnn 
the Gall : And liere our Author calculates the Velocity - 
■ of the blood that comes into the Liver, and proves, 
that what comes by the Mefenterick A rter) into the. t 
Porta, moves 177 times flower in. die. Branches of tlie •; 
Porta 
