240 
Sir Everard Home on 
equal to the support of the enormous bulk of this animal ; 
but this doubt will be removed when I mention, that Mr. 
Fisher informs me that a walrus, killed at Spitzbergen, 
weighed twenty hundred weight, and that an exhausted sur- 
face of twenty eight inches by twenty will support a pressure 
of i5lbs. on every square inch, more than double the animal’s 
weight. 
That the principle on which the foot of the fly, the gecko, 
and the walrus, is formed, is the same, I trust has been 
established. In the fly there are two cups, in the walrus 
only one. 
In Plate VI. the stomach of the walrus, upon the scale of 
an inch to a foot, is represented inverted, to show its in- 
ternal surface. 
The oesophagus is lined with cuticle, which terminates in 
a transverse line at the orifice of the stomach ; at the pylorus 
is a valvular fold, and the aperture is contracted and very 
small. 
Plate VII. fig. 1 , shows the manner in which the gall duct 
terminates in the duodenum ; the parts are upon a scale of 
six inches to a foot. 
Through the coats of the duodenum the size of the duct is 
very distinctly seen. 
Fig. 2, shows the gall bladder upon the same scale, laid 
open, as well as the large duct leading to the gut, till it pene- 
trates through its coats. 
These parts are distinct from the liver, lying directly be- 
hind the duodenum, and connected to it by cellular membrane ; 
the duct by which the bile is brought to this reservoir is 
also shown. 
