a: J. LeConte on Binocular Vision. 
the exact appearance of a et nega: marble pavement made up 
of squares nine inches on ‘ 
In all these experiments the least irregularity in the pat- — 
tern shows itself very conspicuously in the image, not by in- — 
distinctness of outline of the figures, but by apparent ine- — 
quality in the. plane of the image. ‘Thus i in the carpet it ; 
the doubling of the lines causes the eyes instinctively to re- tf 
turn to their former position and thus to restore the image — 
I have sometimes been actually obliged to look away in order | 
to recover the real object. . 
‘ved in m experiments on the | 
ot that each sucess 8 Posie more and more in 
» ekitcha Goose ae eee aes 1864, 
