THIS ADVERTISEMENT AWAKENS THE WRONG KIND OF MENTAL IMAGES. SEE TEXT, PAGE 34] "Another in describing his image of a railroad-train, writes: 'I am not able to state whether I hear the train or not. I am inclined to think that it is a noiseless one. It is hard for me to conceive of the sound of a bell, for instance. I can see the bell move to and fro, and for an instant seem to hear the ding, dong; but it is gone before I can identify it. When I try to conceive of shouts I am like one groping in the dark. I cannot possibly retain the conception of a sound for any length of time.' "Another, who seems to have no vivid images of any kind, writes: 'When I recall the breakfast-table I see it and the persons around it. The number of them is distinct, for there is only one of them on each side of the table. But they seem like mere objects in space. Only when I think of each separately do I clearly see them. As for the table, all I see is a general whiteness, interspersed with objects. I hear nothing at all, and indeed the whole thing is so indistinct it bewilders me when I think of it. My mental imagery is very vague and hazy, unless I have previously taken special notice of what I now have an image of. For instance, when I have an image of a certain person I cannot tell his particular characteristics unless my attention was formerly directed to them.' "Another writes: 'There is no sound in connection with any image. In remembering, I call up an incident and gradually fill out the details. I can very seldom recall how anything sounds. One sound from the play "Robespierre," by Henry Irving, which I heard about two years ago and which I could recall some time afterward, I have been unable to recall this fall, though I have tried to do so. I can see the scene quite perfectly, the position of the actors and stage setting, even the action of a player who brought out the sound.' "Quite a large proportion of persons find it impossible to imagine motion at all. As they think of a football game, all the players are standing stock-still; they are as they are represented in a photograph. They are in the act of running, but no motion is represented. Likewise, the banners and streamers are all motionless. They find it impossible to think of such a thing as motion. Others find that the motions are the most vivid part of their images. What they remember of a scene is principally movement.