In this connection the appearance under reflex eye-movement compares interestingly with that under voluntary.  If the wall WONW (Fig. 5) is taken from before the pendulum, and the eye allowed to move reflexly with the swinging dumb-bell, the entire image is seen at each exposure, the handle seeming no less bright than the end-circles.  Moreover, as the dumb-bell opening swings past the place of exposure and the image fades, although the handle must fade more quickly than the ends, yet this is not discernible, and the entire image disappears without having at any time presented the handleless appearance.

B. Another test for this anaesthesia during movement is offered in the following experiment.  It is clear that, just as a light-stimulation is not perceived if the whole retinal process begins and ends during a movement, so also a particular phase of it should not be perceived if that phase can be given complete within the time of the movement.  The same pendulum which was used in the previous experiment makes such a thing possible.  If in place of the perforated dumb-bell the pendulum exposes two pieces of glass of nearly complementary colors, one after the other coming opposite the place of exposure, the sensations will fuse or will not fuse according as the pendulum swings rapidly or slowly.  But now a mean rate of succession can be found such as to let the first color be seen pure before the second is exposed, and then to show the second fused with the after-image of the first.  Under some conditions the second will persist after the first has faded, and will then itself be seen pure.  Thus there may be three phases in consciousness.  If the first color exposed is green and the second red, the phases of sensation will be green, white, and perhaps red.  These phases are felt to be not simultaneous but successive.  A modification of this method is used in the following experiment. (See Fig. 8, Plate IV.)

T and I here correspond to the cards T and I of Fig. 6. T consists of a rectangular opening, 9x5 cm., which contains three pieces of glass, two pieces of green at the ends, each 2.8 cm. wide and 7 cm. high, and a piece of red glass in the middle 3.4 cm. wide and only 1.5 cm. high, the space above and below this width being filled with opaque material.  The shape of the image is determined as before by the hole in I, which now, instead of being a dumb-bell, is merely a rectangular hole 2 cm. wide and 5 cm. high.  Exactly as before, T is fixed in the background and I swings with the pendulum, the eye moving with it.