(pro) 
fiiew, How exaftly thefe two are calculated for its Motion, and 
how well adapted to diftribute the Bbud into the parts of the 
whole B )dv. 
In the Firfi Chapter then, he confi 'ers the Diver fttj of the 
Situation of the Heart in differcht An raals,and the Keafon there- 
0F5 proceeding to difc >urfe of the Pericardium and k$ Life, 
together with the Origin and Vfe ot the ^erum therein; and 
why in MAn onely that CA^e of tfie Heart gro vsto the Midriff, 
and what makes it to do fo as alfo^why the Cone In an Humane 
Heart bends much more to the Left fide, than in Brutes : Then 
Ihewingj that Arteries have their rife from the Heart, hot Feins 
terminate in it, and how and by what VeiTels the Heart is nou- 
rifht by the Alimentary Jayce : treating alfo of the Fefels 
of the Heart, its Nerves, and the various influx of the Animal 
Spirits through the Nerves into the Heart, according to the 
mious fnipes of Animals, together with the Caufe thereof: 
Proving farther, that the fubitance of the Heart is perfedly Mufr 
cular.znd in perfc6tion furpafling all other Mufclesof the Body 
(where he exfpatiatts into un-common Obfervarions concern- 
ing Mufcles in general 'j ) then defcending toa Minute Explica- 
tion of the pares of the Heartj and there particularly (hewing 
the Mechanical Contrivance of the H^art for its Sjftole and 
Dia/loky together wiih an accurate defcription of the Foramen 
OnjAle, and its Vfc in the FostuSy\Xii theClaufure of the fame in 
Aninials born.. 
In thQ Second chapter he treats of the Motiomnd office of the 
Heart- Where^as He admits notof any Ferment o\ E -sullitionof 
the B'oud in the Heart (which he affi ms would be an Obflacle to 
its Sjsijole, as 'ii.s needlefs to thtBiajlole, ) (o he aiT^nts, that the. 
Motion of the Heart depends not fiom fach an E -^ullition (which 
heprovesby Experimfms, and vindicates from ObjecflionsO bat 
that the geiHiineand immediate Inftruments of the Heart's Mo-^ 
tion areits Fibres.Nerves^and Spirits flowing. through tbem^ the 
a&on of the Heart being altogether conform to that of other 
Mafck^s : Where he takes occafton toxnake it oiat, that the Mo- 
tion of Mufcles isnot crius'd by, their being inflAtedynox by any 
Ex^kfi n of ch(; Spirits palling through them, but after the maa- 
uc;, asuv.; m ii u.kingone another by their hands draw them- 
felves 
