( ) 
rain and is contra£led on al) Cdes, to the end that it 
mWforce the Blood into the Arteries. In fhort, when 
A D E, F, is contraded^ and throws the Blood into ' 
the Heart, the Heart is dilated ; and when the Heart 
flirinks it felf in, and is contracted by the Difcharge of 
the Blood, C, D, G, is dilated ; and thefe three fevefal 
Motions happen in fo fhort a time, and are perform’d fo 
regularly, thatthofe who have obferv’ditcurioufty, are 
qifite aftonifh’d at it : and from lienee we can’t but con- 
clude, that fuch a Motion as this cou’d not be brought 
about, unlefs the Velfel A, D, E, F, had a Valve at A D, 
where it is joyned to the Heart, which Valve is to pre- 
vent the Blood that is ‘thrown into the Heart, from re- 
turning- the fame way, and fo likewife there muft ne- 
ceffarily be another Valve at C, D, to hinder the Blood, 
that is protruded from the Heart, from flowing back into 
the fame. 
I have alfo taken the Heart of a Salmon, arfd caufed 
that to be drawn, as you may fee in Fig, 2. H, I, K, L ; 
in which Figure K, L, M, reprefents that Inflrrument 
that was deferib’d in Fig, i.by A, D, E, F ; as I, N, O, 
fhews that which in Fig, i. was C, D, G. 
Moreover in Fig, 2, I fhew you the Inflrument K, L, 
M, cut open, to the end that we might difcover, as well 
as we could, wkh the naked Eye, the Sinewy Parts 
and their Branches**, all which appear’d as in Fig, 
P, Qj R, S, T, in which (i, R, is the Part that was 
joyn'd to the Heart, and is the fame that in Fig, 2, is re- 
prefented by K L ; in the faid Fig, you mayobferve 
how the Sinewy Parts and their Branches run from 
Qj R, toT *, this Inflrument, or Veflel, is very foft in 
its Parts, and it feems to me alfo, ^that it is not 
ftrong. ^ 
Fig, 4. V, W, X, Y,is that Veflel difleCted, which in 
Fig,%, is reprefented by I, O, N ; which Ve&l is ex- 
ceeding; thick and ftrong^ and is like the Inflrument de- 
“ ‘ feribed 
