W. B. Rogers on Binocular Vision. 187 
me than the opposite side, so that the whole has an oblique or 
perspective attitude either as a plane or concave surface. At the 
same time the near side appears shorter than the other as in cases 
previously explained, (fig. 44,) and thus the resultant of the two 
Squares is visually a quadrilateral of unequal sides. 
n combining by the same process the two unequal circles 
A... B, fig. 90, the left hand side of the resultant appears nearer 
90. 
B c 
than the other and is concave while the other is convex, giving 
the figure an oblique position and a strangely warped appearance. 
hen by cross vision we bring together the similar triangles 
A B, fig. 91, we observe towards 91. 
the apex of the resultant a pecu- 
liar twist of the surface by which 
apex, the whole resultant takes 
the shape of a warped surface not 
ofa plow. By turning the diagram until the vert 
‘brought to the horizontal visual line the resultant is converted 
into a plane figure at right angles to the binocular direction, but 
containing the bases of A and Bas separate parallel lines. A yet 
ng fi 
