savant, jealous of his own reputation, anxious to show his superiority, who loves to censure and deride the feebler brother. If one ever sees a relentless and pitiless review of a book--an exposure, as it is called, by one specialist of another's work--one may be fairly certain that the critic is a minute kind of person. Again, the great specialist is never anxious to obtrude his subject; he is rather anxious to hear what is going on in other regions of mental activity, regions which he would like to explore but cannot. It is the lesser light that desires to dazzle and bewilder his company, to tyrannise, to show off. It is the most difficult thing to get a great savant to talk about his subject, though, if he is kind and patient, will answer unintelligent questions, and help a feeble mind along, it is one of the most delightful things in the world. I seized the opportunity some little while ago, on finding myself sitting next to a great physicist, of asking him a series of fumbling questions on the subject of modern theories of matter; for an hour I stumbled like a child, supported by a strong hand, in a dim and unfamiliar world, among the mysterious essences of things. I should like to try to reproduce it here, but I have no doubt I should reproduce it all wrong. Still, it was deeply inspiring to look out into chaos, to hear the rush and motion of atoms, moving in vast vortices, to learn that inside the hardest and most impenetrable of substances there was probably a feverish intensity of inner motion. I do not know that I acquired any precise knowledge, but I drank deep draughts of wonder and awe. The great man, with his amused and weary smile, was infinitely gentle, and left me, I will say, far more conscious of the beauty and the holiness of knowledge. I said something to him about the sense of power that such knowledge must give. "Ah!" he said, "much of what I have told you is not proved, it is only suspected. We are very much in the dark about these things yet. Probably if a physicist of a hundred years hence could overhear me, he would be amazed to think that a sensible man could make such puerile statements. Power--no, it is not that! It rather makes one realise one's feebleness in being so uncertain about things that are absolutely certain and precise in themselves, if we could but see the truth. It is much more like the apostle who said, 'Lord, I believe; help Thou my unbelief.' The thing one wonders at is the courage of the men who dare to think they KNOW."