As to the treatment of the sensory child, it is a problem of even greater difficulty and danger than that of his motor brother. The very nature of the distinction makes it evident that while the motor individual "gives himself away," so to speak, by constantly acting out his impressions, and so revealing his progress and his errors, with the other it is not so. All knowledge that we are ever able to get of the mental condition of another individual is through his movements, expressive, in a technical sense, or of other kinds, such as his actions, attitudes, lines of conduct, etc. We have no way to read thought directly. So just in so far as the sensory individual is less active, to that degree he is less expressive, less self-revealing. To the teacher, therefore, he is more of an enigma. It is harder to tell in his case what instruction he has appreciated and made his own; and what, on the other hand, has been too hard for him; what wise, and what unwise. Where the child of movement speaks out his impulsive interpretations, this one sinks into himself and gives no answer. So we are deprived of the best way of interpreting him--that afforded by his own interpretation of himself. A general policy of caution is therefore strongly to be recommended. Let the teacher wait in every case for some positive indication of the child's real state of mind. Even the directions given the child may not have been understood, or the quick word of admonition may have wounded him, or a duty which is so elementary as to be a commonplace in the mental life of the motor child may yet be so vaguely apprehended that to insist upon its direct performance may cost the teacher all his influence with the pupil of this type. It is better to wait even at the apparent risk of losing valuable days than to proceed a single step upon a mistaken estimate of the child's measure of assimilation. And, further, the effect of wrong treatment upon this boy or girl is very different from that of a similar mistake in the other case. He becomes more silent, retired, even secretive, when once an unsympathetic relationship is suggested between him and his elder.