gesammte
Physiologie_, 1869, II., S. 418.

[13] Guillery, _ibid._, 1898, LXXI., S. 607; and 1898, LXXIII.,
S. 87.

[14] Huey, Edmund B., _American Journal of Psychology_, 1900,
XI., p. 283.

[15] Dodge, Raymond, and Cline, T.S., PSYCHOLOGICAL REVIEW,
1901, VIII., PP. 145-157.

[16] Schwarz, Otto, _Zeitschrift J. Psychologie u. Physiologie
der Sinnesorgane_, 1892, III., S. 398-404.

This work of Schwarz certainly proves that the explanation of
Cornelius is not correct. Schwarz found that the phenomenon takes
place as well when the head moves and the eyes are fixed relatively to
the head, as when the eyes alone move. He furthermore made this
observation. Meaning by _a_ the point of departure and by _b_ the goal
of either the eye-or the head-movement, movement, he says (_ibid._,
S. 400-2): "While oftentimes the streak of the after-image extended
uninterruptedly to the point _b_, or better seemed to proceed from
this point,--as Lipps also reported--yet generally, under the
experimental conditions which I have indicated, _two streaks_ could be
seen, _separated by a dark space between_; firstly the anomalous one"
(the false streak) "rather brilliant, and secondly a fainter one of
about equal or perhaps greater length, which began at the new
fixation-point _b_ and was manifestly an after-image correctly
localized with regard to the situation of this point. This last
after-image streak did not always appear; but it appeared regularly if
the light at _a_ was bright enough and the background dark.... It was
impossible for this second after-image streak to originate in the
point _b_, because it appeared equally when _b_ was only an imaginary
fixation-point.... This consideration makes it already conceivable
that the two parts of the total after-image _are two manifestations of
the one identical retinal stimulation, which are differently
localized_.... Therefore we must probably picture to ourselves that
the sensation from the strip of the retina stimulated during the quick
eye-movement is, _during the interval of movement or at least during
the greater part of it, localized as if the axis of vision were still
directed toward the original fixation-point. And when the new position
of rest is reached and the disturbance on the retinal strip has not
wholly died away, then the strip comes once more into consciousness,
but this time correctly localized with reference to the new position
of the axis of