420 J. LeConte.on Binocular Vision. 
only s : . : 
of Bae = vo bey a the principle of making tracing 
case of squinting’ of stance from the object itself, In the 
The stisisothie, rane a median screen is inadmissible. 
i na of M. Pictet’s first experiment, fig. 6, will 
: 16. now be easily un- 
derstood. If no me- 
dian screen is used, 
Ss 
fe 
together, so that the 
left-eye image of A, 
