2. Can you find any evidence tending to show that the mind is
independent of the body?

3. _Color-Mixture._ Colored disks can be procured from C. H. Stoelting
Company, Chicago. If a small motor is available, the disks can be
rotated on the motor and the colors mixed. Mix pairs of complementary
colors, also pairs of non-complementary colors, and note the result. A
simple device can be made for mixing colors, as follows: On a board
stand a pane of glass. On one side of the glass put a colored paper and
on the other side of the glass put a different color. By looking through
the glass you can see one color through transmitted light and the other
color through reflected light. By inclining the glass at different
angles you can get different proportions of the mixture, now more of one
color, now more of the other.

4. _Negative After-Images._ Cut out pieces of colored paper a half inch
square. Put one of these on a white background on the table. With elbows
on the table, hold the head in the hands and gaze at the colored paper
for about a half-minute, then blow the paper away and continue to gaze
at the white background. Note the color that appears. Use different
colors and tabulate the results. Try projecting the after-images at
different distances. Project the after-images on different colored
papers. Do the after-images mix with the colors of the papers?

5. An interesting experiment with positive after-images can be performed
as follows: Shut yourself in a dark closet for fifteen or twenty minutes
to remove all trace of stimulation of the retina. With the eyes covered
with several folds of thick black cloth go to a window, uncover the eyes
and take a momentary look at the landscape, immediately covering the
eyes again. The landscape will appear as a positive after-image, with