on Muscular Motion. 
I was desirous of determining more exactly than had hitherto 
been done, the precise insertion of the tendons of the four 
straight muscles of the eye, so as to know whether their ac- 
tion could be extended to the cornea or not. 
In dissecting these muscles to their termination, I found 
that they approached within -§• of an inch of the cornea, before 
their tendons became attached to the sclerotic coat upon which 
they lay ; it was evident that they did not terminate at this 
part, but were so united as to be difficultly separated by dis- 
section ; I therefore endeavoured by gentle force to pull them 
asunder, as in that way the parts would separate in the direc- 
tion of their fibres. In doing this, they not only admitted of 
separation to the edge of the cornea, but brought away a lamina 
of the cornea with them. I thought this would be better seen 
in an eye after putrefaction had begun to take place, but found 
that in that state it could scarcely be demonstrated ; while 
in the recent eye the whole of the external lamina of the cornea 
could be brought away along with the four straight muscles, 
leaving the surface underneath uniform, but without polish, 
and upon the same plane with the sclerotic coat, of which it 
was a continuation. 
As this was a new fact, and a very important one, shewing a 
connection between these muscles and the cornea, I have dried 
the parts, and preserved them in that state, to shew the mode 
in which the tendons of the straight muscles are lost in the 
cornea, giving it the appearance of a central tendon. 
The cornea from this investigation is proved to be com- 
posed of two laminae, the external a continuation of the ten- 
dons of the four straight muscles, the other a continuation of 
the sclerotic coat, and the uniting medium between them is 
not unlike very fine cellular membrane. 
C 2 
