164 S. Rowley on Vision. 
explained why the lateral images of an object which is ata — 
greater or less distance than that of the convergence of the — 
axes, are not apprehended in their true visible positions in the — 
aces of vision. 
Why then does consciousness mistake, precisely as we find it 
doing, the true place of the visible image of any object, lying 
not at the point of intersection of the axes nor at any point — 
equally distant with this from the base of vision ?* 
My answer is, that under tendencies resulting from expe : 
consciousness apprehends erroneously the distances really pre 
, or its action according to the laws of vision, and with 
respect to each lateral image apprehends the distance of the 
surface of vision from the base of vision, and the distance m ~ 
the surface from the image at the center for the distances that — 
would exist between these surfaces and these images, if the 
given image, now laterally and obscurely seen, were with its cor 
responding image of the other eye directly and distinctly exaly 
ined at the center, - 
Hence the place in which such an image seems to be see. 
_ For example, let the’axes be turned to the images of an ob- 
ject at B, fig. 2. They will be seen at B, the left eye’s 27; 
inches, to the left, from its image at T’ of the object at A, f 
the right eye's 2,5, inches, to the right, from its image at T ae 
the object at A, each in a surface of vision, measuring from the : 
apex, 18 inches from the base of vision. sai | 
Let now the axes be turned to the images of the object . a 
A, fig. 1. These will now be seen at A, that of the left eye? 
io inch to the right, from its image at b of the object at B, ao . 
the right eye’s ,°, inch to the left from its image at 6’ of the 
ject at B, each in a surface, measuring from the apex, 5 
. 
on es ect vision, LB hen pi 
_ At first then, the left eye’s image of an object at Bwaenr 
ticularly examined, will always os apprehended at the dista 
of 2.4, inches, to the left, from the image at T’ of an object a 
A in the surface of vision 18 inches from the base. ad to 
ence after due experience will arise a tendency of mi fh 
apprehend this image at a distance of 2,'; inches, to Ler 
from the image of the object at A in the surface of an 
toward bei 
enced by this tendency, with respect to the left eye’s IME, 
6 of the object at B, to igahend 6 inches, the err 
surface of vision from the base, as 18 inches, and 1's"? 
* By base of vision I : dicularly at the center & 
terval between tho ejee, Hy cae crea ea in point and the Bost 
