6. Command 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, sugar, lemon juice, raisins, chocolate,
   currant jelly.

  E. Touch.—­Velvet, silk, soap, gum, sand, dough, a crisp dead leaf,
   the prick of a pin.

  F. Other sensations.—­Heat, hunger, cold, thirst, fatigue, fever,
   drowsiness, a bad cold.

13. Music.—­Have you any aptitude for mentally recalling music, or for imagining it?