394 MR. WHEATSTONE ON THE PHYSIOLOGY OF VISION. 



that cannot be explained by these laws, has, I think, been placed beyond doubt by the 

 experiments I have brought forward. Should it be hereafter proved, that all points 

 in the plane or in the circle above mentioned are seen single, and from the great in- 

 distinctness of lateral images it will be difficult to give this proof, the law must be 

 qualified by the admission, that points out of them do not always appear double. 



