over images_.--Can you retain a mental picture steadily
before the eyes? When you do so, does it grow brighter or dimmer?
When the act of retaining it becomes wearisome, in what part of the
head or eye-ball is the fatigue felt?

7. _Persons_.--Can you recall with distinctness the features of all
near relations and many other persons? Can you at will cause your
mental image of any or most of them to sit, stand, or turn slowly
round? Can you deliberately seat the image of a well-known person
in a chair and see it with enough distinctness to enable you to
sketch it leisurely (supposing yourself able to draw)?

8. _Scenery_.--Do you preserve the recollection of scenery with much
precision of detail, and do you find pleasure in dwelling on it? Can
you easily form mental pictures from the descriptions of scenery
that are so frequently met with in novels and books of travel?

9. _Comparison with reality_.--What difference do you perceive
between a very vivid mental picture called up in the dark, and a
real scene? Have you ever mistaken a mental image for a reality when
in health and wide awake?

10. _Numerals and dates_.--Are these invariably associated in your
mind with any peculiar mental imagery, whether of written or printed
figures, diagrams, or colours? If so, explain fully, and say if you
can account for the association?

11.--_Specialities_.--If you happen to have special aptitudes for
mechanics, mathematics (either geometry of three dimensions or pure
analysis), mental arithmetic, or chess-playing blindfold, please
explain fully how far your processes depend on the use of visual
images, and how far otherwise?

12. Call up before your imagination the objects specified in the six
following paragraphs, numbered A to F, and consider carefully
whether your mental representation of them generally, is in each
group very faint, faint, fair, good, or vivid and comparable to the
actual sensation:--

A. _Light and colour_.--An evenly clouded sky (omitting all landscape),
first bright, then gloomy. A thick surrounding haze, first white,
then successively blue, yellow, green, and red.

B. _Sound_.--The beat of rain against the window panes, the crack of
a whip, a church bell, the hum of bees, the whistle of a railway,
the clinking of tea-spoons and saucers, the slam of a door.

C. _Smells_.--Tar, roses, an oil-lamp blown out, hay, violets, a fur
coat, gas, tobacco.

D. _Tastes_.--Salt, su