like the rest of the world; but whatever by-ends may mar their dignity and impede their usefulness, this chief end redeems them.[B] Nothing great in science has ever been done by men, whatever their powers, in whom the divine afflatus of the truth-seeker was wanting.  Men of moderate capacity have done great things because it animated them; and men of great natural gifts have failed, absolutely or relatively, because they lacked this one thing needful.

[Sidenote:  True aim and method of research.]

To anyone who knows the business of investigation practically, Bacon’s notion of establishing a company of investigators to work for ‘fruits,’ as if the pursuit of knowledge were a kind of mining operation and only required well-directed picks and shovels, seems very strange.[C] In science, as in art, and, as I believe, in every other sphere of human activity, there may be wisdom in a multitude of counsellors, but it is only in one or two of them.  And, in scientific inquiry, at any rate, it is to that one or two that we must look for light and guidance.  Newton said that he made his discoveries by ‘intending’ his mind on the subject; no doubt truly.  But to equal his success one must have the mind which he ‘intended.’  Forty lesser men might have intended their minds till they cracked, without any like result.  It would be idle either to affirm or to deny that the last half-century has produced men of science of the calibre of Newton.  It is sufficient that it can show a few capacities of the first rank, competent not only to deal profitably with the inheritance bequeathed by their scientific forefathers, but to pass on to their successors physical truths of a higher order than any yet reached by the human race.  And if they have succeeded as Newton succeeded, it is because they have sought truth as he sought it, with no other object than the finding it.

* * * * *

[Sidenote:  Progress from 1837 to 1887.]

I am conscious that in undertaking to progress give even the briefest sketch of the progress of physical science, in all its branches, during the last half-century, I may be thought to have exhibited more courage than discretion, and perhaps more presumption than either.  So far as physical science is concerned, the days of Admirable Crichtons have long been over, and the most indefatigable of hard workers may think he has done well if he has mastered one of its minor subdivisions.  Nevertheless, it is possible for anyone, who has familiarised himself with the operations of science in one department, to comprehend the significance, and even to form a general estimate of the value, of the achievements of specialists in other departments.