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590 and recognized truths. There can be no doubt of the conclusion to be drawn from this proposition: this scientifically untenable conception must be given up, and replaced, if possible, by another and better one. I believe that I can answer the question that would naturally be asked here, whether another better view exists, in the affirmative. What I have to say on the subject will therefore be legitimately divided into two parts—the destructive and the constructive. It is easier in this case, as in others, to destroy than to build up, and the insufficiency of the usual mechanical view will be easier to demonstrate than the sufficiency of the new one, which I shall call the energistic view. But if I declare at once that this new theory has already had opportunity to show its quality in the field of experimental science, so favorable to calm examination and impartial testing, it will then be able, even if it can not secure conviction of its correctness, to demand recognition of its claim to consideration.

It may not be superfluous for me to announce in the beginning that I contemplate an exclusively scientific discussion. I put away absolutely and unconditionally all conclusions which might be drawn from the result for other, ethical and religious, purposes. I do this, not because I undervalue the importance of such considerations, but because my result has been obtained independently of them, purely on the ground of exact science. Even for the tilling of this ground the word holds good that he who puts hand to the plow and looks back is not made for the kingdom. The naturalist is pledged to declare what he has found, whomsoever it may hurt or help, and we may surely trust that earnest seeking, though it may lead us astray for a little while, will never do it permanently. I do not forget that my attempt places me in contradiction with the opinions of men who have achieved much in science, and to whom we all look up in admiration. I hope you will not impute conceit to me because I differ from them on so important a subject. It is not conceit when the sailor whose post is in the "crow's nest" causes the course of the great ship on which he is only a servant to be turned by the cry of "Breakers ahead!" It is his duty to tell what he sees, and he would fail in this duty if he neglected to do so. In the same sense I have a duty to discharge. Yet none of you is obliged to change his scientific course merely on my call of "Breakers ahead!" Each of you may test whether a reality stands before my eyes, or I am deceived by a vision. But since I believe that the special kind of scientific work which is my calling permits me for the moment to discern certain phenomena more clearly than they appear from other points of view, I should consider it wrong if I failed for reasons outside of it to speak of what I have seen.

In order to set ourselves right in the infinity of the world of