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Rh be on his guard. Every one familiar with his writings is aware that he differs from most of his scientific colleagues by looking habitually from the subject he is investigating to the working of his own mind in the investigation, and by frequently throwing parenthetical remarks of a philosophical, rather than of a strictly scientific significance, into his expositions. The interjected observations about authority in the preface are clearly of this kind. In his "Lectures on Light," second edition, page 80, he remarks: "Newton's espousal of the emission theory is said to have retarded scientific discovery. It might, however, be questioned whether, in the long-run, the errors of great men have not really the effect of rendering intellectual progress rhythmical, instead of permitting it to remain uniform, the retardation in each case being the prelude to a more impetuous advance. It is confusion and stagnation rather than error that we ought to avoid." Now, the underlying thought in the passage from the preface above quoted is manifestly the same as that here expressed. The object in both cases is, simply to bring out the uses of authority, and no candid reader will recognize any element of "self-laudation" in the one case any more than in the other.

It has hitherto been thought that, as discoveries are the result of mental operations, science is always the gainer, when an intelligent account is given of the intellectual processes by which a new result is reached; but it now seems that if one refers to his own thoughts he must expect to be snubbed as an egotist. And, particularly, if he attains conclusions of moment, involving the upsetting of former theories, and where it is of increased importance to know the mental operations that lead to them, he will be pretty certain to find some mocking cynic who will twit him with his "self-consciousness, explaining to itself and to others how it grew so great." It is a little comical, however, to take lessons in humility from a writer who mounts the judgment-seat and exhausts the vocabulary of abuse in depreciating others; or to listen to homilies on modesty from a journal that sets up each week to criticise all that is going on in the universe—while both are convicted of detraction on the basis of the most brazen perversions.

ask careful attention to the argument of President White on the "Warfare of Science," the first installment of which opens the present number of the and the second of which will appear in our next issue. The import of his clear-cut thesis, and the vigor, learning, and logical force, with which it is sustained, will command the admiration of all intelligent students of the subject. But that which makes President White's discussion unique, and especially valuable, at this time, is the copious notes and references by which it is enriched and fortified, and which open the way to the whole literature of the question for the benefit of those who desire to consult the original authorities. At this time, when the hot temper of controversy leads to much random and reckless statement, it is desirable to know, very clearly, what can be proved, and where the proof can be found: President White's article is, therefore, opportune, and will be especially valued at present, while it must also take its place as a permanent contribution to a question which is bound to be of increasing interest in the future.

That we may not be accused of partiality or injustice to opposite views, we print also, in this number, an elaborate and earnest argument, delivered at the inauguration of Vanderbilt University, by Dr. Deems, on the other side of the question. The address is liberal in spirit, and often bold in its concessions, but we can hardly assent to its opening declarations. The author