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as mountain mists blot out the valleys. For every synthesis of fact to fact, every attempt to know, however humble and limited, is inspired by a secret faith in the unity of the world. Each of the sciences works within its own region, and colligates its details in the light of its own hypothesis; and all the sciences taken together presuppose the presence in the world of a principle that binds it into an orderly totality. Scientific explorers know that they are all working towards the same centre. And, ever and anon, as the isolated thinker presses home his own hypothesis, he finds his thought beating on the limits of his science, and suggesting some wider hypothesis. The walls that separate the sciences are wearing thin, and at times light penetrates from one to the other. So that to their votaries, at least, the faith is progressively justified, that there is a meeting point for the sciences, a central truth in which the dispersed rays will again be gathered together. In fact, all the sciences are working together under the guidance of a principle common to them all, although it may not be consciously known and no attempt is made to define it. In science, as in philosophy and art and religion, there is a principle of unity, which, though latent, is really prior to all explanation of particular matters of fact.

      In truth, man has only one way of knowing. There is no fundamental difference between scientific and philosophic procedure. We always light up facts by means of general laws. The fall of the stone was a perfect enigma, a universally unintelligible bit of experience, till the majestic imagination of Newton conceived the idea of universal gravitation. Wherever mind successfully invades the realm of chaos, poetry, the sense of the whole, comes first. There is the intuitive flash, the penetrative glimpse, got no one knows exactly whence—though we do know that it comes neither from the dead facts nor from the vacant region of a priori thought, but somehow from the interaction of both these elements of knowledge. After the intuitive flash comes the slow labour of proof, the application of the principle to details. And that application transforms both the principle and the details, so that the former is enriched with content and the latter are made intelligible—a veritable conquest and valid possession for mankind. And in this labour of proof, science and philosophy alike take their share.

      Philosophy may be said to come midway between poetry and science, and to partake of the nature of both. On the one side it deals, like poetry, with ideals of knowledge, and announces truths which it does not completely verify; on the other, it leaves to science the task of articulating its principles in facts, though it begins the articulation itself. It reveals subsidiary principles, and is, at the same time, a witness for the unity of the categories of science. We may say, if we wish, that its principles are mere hypotheses. But so are the ideas which underlie the most practical of the sciences; so is every forecast of genius by virtue of which knowledge is extended; so is every principle of knowledge not completely worked out. To say that philosophy is hypothetical implies no charge, other than that which can be levelled, in the same sense, against the most solid body of scientific knowledge in the world. The fruitful question in each case alike is, how far, if at all, does the hypothesis enable us to understand particular facts.

      The more careful of our scientific thinkers are well aware of the limits under which they work and of the hypothetical character of their results. "I take Euclidean space, and the existence of material particles and elemental energy for granted," says the physicist; "deny them, and I am helpless; grant them, and I shall establish quantitative relations between the different forms of this elemental energy, and make it tractable and tame to man's uses. All I teach depends upon my hypothesis. In it is the secret of all the power I wield. I do not pretend to say what this elemental energy is. I make no declaration regarding the actual nature of things; and all questions as to the ultimate origin or final destination of the world are beyond the scope of my inquiry. I am ruled by my hypothesis; I regard phenomena from my point of view; and my right to do so I substantiate by the practical and theoretical results which follow." The language of geology, chemistry, zoology, and even mathematics is the same. They all start from a hypothesis; they are all based on an imaginative conception, and in this sense their votaries are poets, who see the unity of being throb in the particular fact.

      Now, so far as the particular sciences are concerned, I presume that no one will deny the supreme power of these colligating ideas. The sciences do not grow by a process of empiricism, which rambles tentatively and blindly from fact to fact, unguided of any hypothesis. But if they do not, if, on the contrary, each science is ruled by its own hypothesis, and uses that hypothesis to bind its facts together, then the question arises, are there no wider colligating principles amongst these hypotheses themselves? Are the sciences independent of each other, or is their independence only surface appearance? This is the question which philosophy asks, and the sciences themselves by their progress suggest a positive answer to it.

      The knowledge of the world which the sciences are building is not a chaotic structure. By their apparently independent efforts, the outer kosmos is gradually reproduced in the mind of man, and the temple of truth is silently rising. We may not as yet be able to connect wing with wing, or to declare definitely the law of the whole. The logical order of the hypotheses of the various sciences, the true connection of these categories of constructive thought, may yet be uncertain. But, still, there is such an order and connection: the whole building has its plan, which becomes more and more intelligible as it approaches to its completion. Beneath all the differences, there are fundamental principles which give to human thought a definite unity of movement and direction. There are architectonic conceptions which are guiding, not only the different sciences, but all the modes of thought of an age. There are intellectual media, "working hypotheses," by means of which successive centuries observe all that they see; and these far-reaching constructive principles divide the history of mankind into distinct stages. In a word, there are dynasties of great ideas, such as the idea of development in our own day; and these successively ascend the throne of mind, and hold a sway over human thought which is well-nigh absolute.

      Now, if this is so, is it certain that all knowledge of these ruling conceptions is impossible? In other words, is the attempt to construct a philosophy absurd? To say that it is, to deny the possibility of catching any glimpse of those regulative ideas, which determine the main tendencies of human thought, is to place the supreme directorate of the human intelligence in the hands of a necessity which, for us, is blind. For, an order that is hidden is equivalent to chance, so far as knowledge is concerned; and if we believe it to exist, we do so in the face of the fact that all we see, and all we can see, is the opposite of order, namely lawlessness. Human knowledge, on this view, would be subjected to law in its details and compartments, but to disorder as a whole. Thinking men would be organized into regiments; but the regiments would not constitute an army, nor would there be any unity of movement in the attack on the realm of ignorance.

      But, such is not the conclusion to which the study of human history leads, especially when we observe its movements on a large scale. On the contrary, it is found that history falls into great epochs, each of which has its own peculiar characteristics. Ages, as well as nations and individuals, have features of their own, special and definite modes of thinking and acting. The movement of thought in each age has its own direction, which is determined by some characteristic and fundamental idea, that fulfils for it the part of a working hypothesis in a particular science. It is the prerogative of the greatest leaders of thought in an age to catch a glimpse of this ruling idea when it first makes its appearance; and it is their function, not only to discover it, but also to reveal it to others. And, in this way, they are at once the exponents of their time, and its prophets. They reveal that which is already a latent but active power—"a tendency"; but they reveal it to a generation which will see the truth for itself, only after the potency which lies in it has manifested itself in national institutions and habits of thought and action. After the prophets have left us, we believe what they have said; as long as they are with us, they are voices crying in the wilderness.

      Now, these great ideas, these harmonies of the world of mind, first strike upon the ear of the poet. They seem to break into the consciousness of man by the way of emotion. They possess the seer; he is divinely mad, and he utters words whose meaning passes his own calmer comprehension. What we find in Goethe, we find also in a manner in Browning: an insight which is also foresight, a dim and partial consciousness of the truth about to be, sending its light before it, and anticipating all systematic reflection. It is an insight which appears to be

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