htest at the end nearer
the light. (2) If the eye-movement is 40 deg. or more, a streak having a
length of about one third the distance moved through is seen on the
other side of the light from the final fixation-point; while another
streak is seen of the length of the distance moved through, and
extending from the final fixation-point to the light. The first is the
falsely, the second the correctly localized streak. The second, which
is paler than the first, feels as if it appeared a moment later than
this. The brighter end of each streak is the end which adjoins the
luminous spot. (3) Owing to this last fact, it sometimes happens, when
the eye-movement is 40 deg. or a trifle less, that both streaks are seen,
but that the feeling of succession is absent, so that the two streaks
look like one streak which lies (unequally parted) on both sides of
the spot of light. It was observed, in agreement with Schwarz, that
the phenomenon was the same whether the head or the eyes moved. Only
one other point need be noted. It is that the false streak, which
appears in the beginning to dart from the luminous hole, does not
fade, but seems to suffer a sudden and total eclipse; whereas the
second streak flashes out suddenly _in situ_, but at a lesser
brilliancy than the other, and very slowly fades away.

These observations thoroughly confirmed those of Schwarz. And one
could not avoid the conviction that Schwarz's suggestion of the two
streaks being separate localizations of the same retinal stimulation
was an extremely shrewd conjecture. The facts speak strongly in its
favor; first, that when the arc of movement is rather long, there is a
distinct feeling of succession between the appearances of the falsely
and the correctly localized images; second, that when both streaks are
seen, the correct streak is always noticeably dimmer than the false
streak.

It is of course perfectly conceivable that the feeling of succession
is an illusion (which will itself then need to be explained), and that
the streak is seen continuously, its spacial reference only undergoing
an instantaneous substitution. If this is the case, it is singular
that the correctly seen streak seems to enter consciousness so much
reduced as to intensity below that of the false streak when it was
eclipsed. Whereas, if a momentary anaesthesia could be demonstrated,
both the feeling of succession and the discontinuity of the
intensities would be explained (since during the