There is nothing in that doctrine to alarm the most mystical of believers.

In the completeness with which it is now brought before us it is doubtless new and wonderful, and will doubtless tend presently to clarify human thought.

But no one need fear to accept it as a truth; and probably before long we shall all accept it as a truism.

It is not denying the existence of a soul to say that it cannot move in matter without leaving some impress in matter, any more than it is denying the existence of an organist to say that he cannot play to us without striking the notes of his organ.

Dr.Tyndall then need hardly have used so much emphasis and iteration in affirming that '_every thought and feeling has its definite mechanical correlative, that it is accompanied by a certain breaking-up and re-marshalling of the atoms of the brain_.' And he is no more likely to be '_hacked and scourged_' for doing so than he would be for affirming that every note we hear in a piece of music has its definite correlative in the mechanics of the organ, and that it is accompanied by a depression and a rising again of some particular key.