=Use of Different Images in Teaching.=--The importance to the teacher of an intimate knowledge of different types of imagery and of a further acquaintance with the more prevailing images of particular pupils, is evident in various ways. In the first place, different school subjects may appeal more especially to different types of imagery. Thus a study of plants especially involves visual, or sight, images; a study of birds, visual and auditory images; oral reading and music, auditory images; physical training, motor images; constructive work, visual, tactile, and motor images; a knowledge of weights and measures, tactile and motor images. On account of a native difference in forming images, also, one pupil may best learn through the eye, another through the ear, a third through the muscles, etc. In learning the spelling of words, for example, one pupil may require especially to visualize the word, another to hear the letters repeated in their order, and a third to articulate the letters by the movement of the organs of speech, or to trace them in writing. In choosing illustrations, also, the teacher will find that one pupil best appreciates a visual illustration, a second an auditory illustration, etc. Some young pupils, for instance, might best appreciate a pathetic situation through an appeal to such sensory images as hunger and thirst. =An Illustration.=--The wide difference in people's ability to interpret sensuous impressions is well exemplified in the case of sound stimuli. Every one whose ear is physically perfect seems able to interpret a sound so far as its mere quality and quantity are concerned. In the case of musical notes, however, the very greatest difference is found in the ability of different individuals to distinguish pitch. So also the distinguishing of distance and direction in relation to sound is an acquired ability, in which different people will greatly differ. Finally, to interpret the external relations involved in the sound, that is, whether the cry is that of an insect or a bird, or, if it is the former, from what kind of bird the sound is proceeding, this evidently is a phase of sense interpretation in which individuals differ very greatly. Yet an adequate development of the sense of hearing might be supposed to give the individual an ability to interpret his surroundings in all these ways.