4 
q 
2 
q 
F ; 
" 
i 
: 
W. LeConte Stevens— Notes on Physiological’ Optics. 291 
Binocular Vision,” and subsequently in his book on the Stereo- 
scope,” published in 1856. Professor W. B. Rogers contributed 
to this Journal in 1855 and 1856 a series of most interesting 
articles on Binocular Vision,‘ in which he determined matbe- 
matically what should be the form of the resultant curve when 
images of dissimilar lines are binocularly combined, each point 
June 6th and Aug. 19th, 1881, the latter having since been 
published in this Journal. It is a source of satisfaction now to 
find, in the London Lancet, of Oct. 22d, and Dec. 31st, 1881, 
two able papers written by Brigade Surgeon Tyler Oughton, of 
the English army, who with no knowledge of what had been 
expressed by me, reaches conclusions closely akin to my own, 
substituting for the current theory that of “muscular consent,” 
and rejecting the theory of corresponding retinal points. 
t is but right to add that this theory was virtually stated 
by Professor Huxley” in 1868, and in such a way as quite 
plainly to indicate its applicability to the phenomena of optic 
divergence. That he should have been satisfied with a brief 
Statement that has passed almost unnoticed, instead of elabo- 
