J, LeConte on Binocular Vision. 71 
Upon this second image the same experiment may be re- 
peated so as to make a third image still smaller and nearer the 
eye at d'” e’”’ and from ; 2. 
the third even a fourth 
and still smaller image 
y be formed at e’’”, 
The position of these suc- 
cessive planes are indi- 
cated by the dotted lines; 
but in this figure the po- 
sition of the axes is only 
ae to vision on plane 
ao a b € é 
erect and looking down ott the regularly checkered carpet on 
i 4; inches from 
Of the floor rises to it and * 
. To get the second plane, look again at the flo = 
