_ c ijn ■ . 
ved thereabouts 5 and no fooner was the Air got into tliat 
Bladder, but it did, as it were, firll: contrad and then 
dilate it felf, fo regularly and in fuch a manner, that 
when the Heart contraded it felf fjuft as if it were go- 
ing to throw out it’s Blood,) the aforefaid little Bladder 
with Air in it was dilated ^ and this did not happen for 
a fmall time, but the Bladder continued in fuch a Mo- 
tion above five full Hours together ; but indeed in the 
lafl libur it was fo faint, that one could but juft per-- 
ceive it ; and as for the Heart, its Motion was difeonti- 
nued* 
I caufed moreover a Pike-fifli to be brought me about 
two Foot long, and open’d it immediately whilft it was 
in its full ftrength of Life, *and obferv’d not only the 
Motion of the Heart, and the regular Motion of that 
part which receives the Bipod, and brings it into the . 
Heart, but alfo the Motion of that other part, wliich 
receives the protruded Blood from the Heart, and car- 
ries it gently into the Arteries. 
Now becaufe very few have any manner of know- 
ledge of the Heart of a Pike, and the Motion thereof, I 
have caufed fuch a Heart, with the VelTels and Inftru- 
ments belonging to it, to be drawn by my Fainter. 
tig, I. A, B, C, D, fhews the Heart ofa Pike; D, E, 
F, A, reprefents that part into which the Blood is 
brought from the Veins ; and C, D, G, that other part 
which receives the Blood from the Heart, to carry it in- 
to the Arteries. 
■ Now when the Heart receives the Blood which is 
conveyed into it, it dilates it felf into its utmoftround- 
nefs^ and then that Inftrument or Velfel deferib’d by' 
A, D, E, F, does at that very inftant fall as it were quite 
down from its Swelling or Extenfion, and difeharging 
it felf of its Blood into the Veffel C, D, G, all Parts of it 
become extended by the hidden pouring in of the Bloody 
and no fooner is it fo dilated, but it draws it ielf in a- 
O 0 2 gain, 
