In children these motor residua may persist as characteristic features of inflection, accent, or manners; automatisms may become morbid in stammering or stuttering, or they may be seen in gait, handwriting, tics or tweaks, etc. Instead of disappearing with age, as they should, they are seen in the blind as facial grimaces uncorrected by the mirror or facial consciousness, in the deaf as inarticulate noises; and they may tend to grow monstrous with age as if they were disintegrated fragments of our personality, split off and aborted, or motor parasites leaving our psycho-physic ego poorer in energy and plasticity of adaptation, till the distraction and anarchy of the individual nature becomes conspicuous and pathetic. At puberty, however, when muscle habits are so plastic, when there is a new relation between quantity or volume of motor energy and qualitative differentiation, and between volitional control and reflex activities, these kinetic remnants strongly tend to shoot together into wrong aggregates if right ones are not formed. Good manners and correct motor form generally, as well as skill, are the most economic ways of doing things; but this is the age of wasteful ways, awkwardness mannerisms, tensions that are a constant leakage of vital energy, perhaps semi-imperative acts, contortions, quaint movements, more elaborated than in childhood and often highly anesthetic and disagreeable, motor coördinations that will need laborious decomposition later. The avoidable factor in their causation is, with some modification, not unlike that of the simpler feral movements and faulty attitudes, carriage, and postures in children; viz., some form of overpressure or misfit between environment and nature. As during the years from four to eight there is great danger that overemphasis of the activities of the accessory muscles will sow the seeds of chorea, or aggravate predispositions to it, now again comes a greatly increased danger, hardly existing from eight to twelve, that overprecision, especially if fundamental activities are neglected, will bring nervous strain and stunting precocity. This is again the age of the basal, e.g., hill-climbing muscle, of leg and back and shoulder work, and of the yet more fundamental heart, lung, and chest muscles. Now again, the study of a book, under the usual conditions of sitting in a closed space and using pen, tongue, and eye combined, has a tendency to overstimulate the accessory muscles. This is especially harmful for city children who are too prone to the distraction of overmobility at an age especially exposed to maladjustment of motor income and expenditure; and it constitutes not a liberal or power-generating, but a highly and prematurely specialized, narrowing, and weakening education unless offset by safeguards better than any system of gymnastics, which is at best artificial and exaggerated.