190 Dr. Jeffries on the Skeleton of an Ourang Outang. 
The articulation of the hip would make it more easy for him 
to go erect, on account of the little angle made by the neck 
with the body of the femur. 
Secondly. In walking erect, he would derive advantage 
from the extension of the os calcis and the length of the foot; 
and also from the position of the arms so far back, and from 
their length, which would enable him to balance the body by 
them. ; 
Thirdly. From the structure of the viscera he seems to be 
peculiarly formed for an erect posture. 
The pericardium being united extensively with the dia- 
phragm, would prevent it from being drawn down by the weight 
of the liver and abdominal viscera. In quadrupeds this is not 
necessary, for the pressure of the abdominal contents assists 
expiration, ‘and if the pericardium was attached to the dia- 
phragm as in the Satyrus and in man, inspiration would be 
impeded. 
The exit of the spermatic cord is another difference from 
quadrupeds. It does not pass out directly from the abdomen, 
as in the dog, but perforates the peritoneum and muscles 
obliquely, as has been described, thereby giving that admira- 
ble structure to fortify the groin from rupture, which exists 
in man. 
The viscera of the abdomen were suspended to bear weight 
in the erect posture, particularly the liver, which had its liga- 
ments very strong. 
From these and other circumstances, apparent from an ex- 
amination of the skeleton, I think we must conclude the erect 
posture to have been most natural. At least, if it is humili- 
ating to dignify him with the title of a biped, he stands ac- 
quitted from that of a quadruped from the peculiar formation 
of his lower extremities. We must then denominate him, as 
some naturalists have done, a quadrumanus animal. 
Note.—The preparations which have been made from him are 
The skin stuffed and prepared to exhibit his external ap- 
pearance. 
His natural skeleton entire. 
The heart fully injected, with the aorta and other vessels, 
and the lungs 7m sééu, with a portion of the diaphragm. 
The tongue, larynx, pharynx, &c. exhibiting the peculiar 
structure of its connexion with the pouch, and its general re- 
semblance to man’s. 
Dried preparations of the stomach, caput coli, and its ap- 
pendix, and of the urinary and gall bladders. 
Boston, July 1, 1825. 
XXVIII. De- 
