( '71 ) 
have then Rckfon to hope, that thpfe who concern 
tbemfelves in thefe Matters, will not difapprcve the 
Care I have taken to have fome brought from America 5 
and to let them know the Structure ot the Heart of this 
Animal, which, of all that nfght have been chofen, is 
the moft proper to convince Mr. Mery of his miftake, 
_and confirm the ufe of the Valve of the Foramen Ovale 
in the Heart of an Human F<ctuj, cftablifh’d firft by Dr. 
Harvey , and confirmed and demonftrated by all Anato- 
mifts fince his time. The Strudure o f the Heart of this 
Animal being very fimple, and the ufe of the double 
Valve , which covers the two Foramina of the Auricle , 
in the Sole Ventricule of the Heart, fo plain and fo ma* 
nifeft, that *tis not poffible to miftake, as it will be 
acknowledg’d by the Defcription of its Parts and its 
principal Veflels. I differed three fucccffively of the 
five I received from Jamaica in September laft, being yet 
alive, in the Prefence of Dr. Sloane> Dr- Sylvejlre , Mr. 
Pujolas , and Mr. Lafage , an able Surgeon of London , 
all being occular Witnefles of what I alfert. The 
other two being dead by that time, 1 caufed their Hearts 
to be taken out entire 5 one of which I fent to be 
diflfeded in Park, and I kept the other to fatis r y Hie 
Curiofity of thofe who will fee.it. 
A Defcription of the Heart of a Land Tortoife of 
America. 
» * ■ j r ^ ^ * > ■ , . . 
I M* . ' * Z a . - • ' • « Z • i J . . , ; . T 
The Heart in this Animal is fituated in the anterJor 
part of the capacity that maketh the Abdomen, fepara- 
ted from all the other V/fcera by a large Pericardium , 
which enclofeth it. This Pericardium is faftned by it*- 
fuperior part to the Spine of the Back, by the anterior 
to the-Mufcles of the Neck 5 which is the caufe that 
the Heart rnoveth forward when the Animal putteth 
forth his Head out of the Shell, and backward when 
be 
