( >74 ) 
Veins, the Heart and Auricles comes out of the Body $ 
and then if you fufpend the Heart by the Auricles , they 
refemble two Funnels joyned together, the little end 
of which opens into the Ventricle of the Heart, to 
pour the Blood into it : And ’tis in this manner we are 
to conceive them, in the Natural Situation of the A- 
nimal. 
After having thus confidered the External Parts of 
the Heart and its Auricles , we are to proceed to the 
Examination of the infide of both of them. In or- 
der to that, it muft be opened at its Inferior Surface, 
(fuppofing the Animal turned upon its Back; becaufe 
all the Orifices of either the Arteries and Veins, and 
their Valves , are in the oppofite fide: Therefore a 
Probe may be introduced through one of the Arteries i 
into the Heart, and it opened upon it$ after that, you 
cut all 1 his fide round about the Inferior Circumference, 
from one Angle to the other, and then turn over all I 
that part which is cut on the Bajis of the Heart : 
For then it is eify to remark and view all the Internal 
Parts of an Heart, and obferve that there is but one 
foie Ventricle , which comprehends the whole extent of 
the Heart, and is as uniform and plain as either of the 
Ventricles of the Human Hearr, or of any o$her Ani- 
mal whatfoever 3 and that it is impoffible to remark . 
any kind of Septum, either Mufculous or Membranous, 
that might make any Divifion or Cellule in this Ventri- 
cule : And ’ris very furprizing, that the Anatomifts of 
the Royal Academy of Paris have (hewn, the one three, 
and the other four Ventricles , in the Heart of a Land 
Tortoife of America . I confefs this Difficulty is to 
roe and the Gentlemen who have feen them differ- 
ed, a Myftery, which thefe Anatomifts and their Ap. 
provers will difeover to us when they (hall think 
fit. 
After 
