406 W. B. Rogers on Retinal Impressions. 
Let the spot be now moved toward the right side but still 
within the range of the left eye and it will seem to be before 
the right eye rather than the left. Shift it into the right com- 
partment but not far from the dividing line and it will appear as 
if seen chiefly by the left eye, and finally bring it to the middle 
of the right compartment and it will seem as at first to belong 
equally to both eyes.* 
erring to the results observed in the above experiments 
when the object is directly in front of either eye it may be con- 
_ These observations show moreover that the perceived direction 
as just as truly normal to the central part of the retina which 
has received no light as to that of the retina on which the white 
oi before which the suggestion just mentioned would naturally 
place it. ; 
A like explanation applies to the transposition observed in 
* The effect here described is one of a series of phenomena which Dr. 0. W. 
Holmes attributes to an actual transfer of impressions from one eye to the oe 
if 
and which he proposes to explain by the hypothesis of reflex vision. Proc 
Acad. Arts and Sciences, Feb. 1860. 4 ices 
