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impulse of each effort in the combined movement is lost, and the changing conditions developed by the progress itself of action, be these recognized or unrecognized with increasing, self-poised force sustain it. Here, we would look, so far as we would look at all, for the sub-conscious region of Hamilton and others. It is in the case of the will found in purely physical phenomena which transpire chiefly in the lower nervous centres, or, if in the cerebrum, in it simply as a nervous centre and not as the agent of mind. Here the physical and the mental are closely united, inseparably blended with each other, and muscular education lies in substituting involuntary for voluntary connections in establishing an independent movement which the mind may at any moment modify or correct, but is not called upon momentarily to sustain. Thus we quicken or check inspiration, though the ordinary action of the lungs proceeds independently of the will. Again, we wink when we will, yet wink constantly also under a purely vital impulse. The movements in walking are illustrations of this interlacing of the voluntary and involuntary the slow displacement of the one by the other. A walk determined on, the mind may busy itself with other things, and the muscular play be unconsciously sustained. If, however, any portion of the way presents peculiar difficulties, attention is renewed, and a voluntary stimulus quickens the muscles to the needed effort. The leap made, the embarrassments overcome, the automatic movement again sets in. There is, perhaps, no more complete example of self sustained action, reached as the result of protracted, voluntary effort, than that of reading. In fluent enunciation, the organs of speech are modified each minute so as to express several hundred distinct sounds. These rapid and precise changes go on unconsciously. There is no direct, voluntary impulse back of them. So far is this true, that it is