i8 
Mr. Home's Lecture 
motion of the cornea was uncommonly distinct. Sir Henry 
now became the subject of the experiment, and changed the 
adjustment of his eye from one distance to another in a very 
irregular manner, without giving the smallest information, 
with a view to embarrass Mr. Ramsden who was the observer, 
but without effect, for Mr. Ramsden was able to tell every 
change in distance he had made, without a single mistake ; 
this exceeded our expectation, and appeared to us so satisfac- 
tory that we required no further proofs of the truth of our 
former observations. 
Before we concluded our experiments, every mode that 
could be devised was put in practice to see how far there might 
be any deception ; the eye was moved upon its axis, and in 
different directions, but these motions did not give at all simi- 
lar appearances to those seen in the adjusting of the eye to 
different distances. 
From the different experiments which I have had the ho- 
nour to lay before this learned Society, I shall consider the 
following facts to have been ascertained. 
ist. That the eye has a power of adjusting itself to different 
distances when deprived of the crystalline lens ; and therefore 
the fibrous and laminated structure of that lens is not in- 
tended to alter its form, but to prevent reflections in the pas- 
sage of the rays through the surfaces of media of different 
densities, and to correct spherical aberration. 
2d, That the cornea is made up of laminae ; that it is elas- 
tic, and when stretched, is capable of being elongated ~ part 
of its diameter, contracting to its former length immediately 
upon being left to itself. 
3d, That the tendons of the four straight muscles of the eye 
