418 J. LeConte on Binocular Vision. 
and the right-eye image of the pencil p; and these, being in 
the visual line of the two eyes, are brought together by the law 
of corresponding points (2) precisely as the two pictures of a 
stereoscopic card are united, or as any two objects, an interocu- 
lar space apart, are superposed when we gaze at a distant point. 
If M. Pictet had used his left hand to draw, then he would have 
used corresponding images of the pencil and piece; and he would 
have found that in attempting to draw his ilusive image he 
would have placed his pencil on the prece. 
n the ex- 
periment with- 
out the median 
visual results, 
igs. 11 and 18, it will 
be observed that the ad- 
ditional images, viz: @ 
and P’, are cut off by 
the median screen. 
is evident, there- 
—s 
tet’s experiments, 
image we see and trace 
in outline is not an 7m 
I 
age seen by the left, eye. 
The pencil we see with 
the right eye, and the 
two points, viz: 
pencil and money, OF 
the part of the i ss 
; : whic y make 
drawing and the money, being in the = Sea are brought 
— 
