Now let a philosopher like Heracleitus be meditating on nature as a circulatory system, and let him, by chance or otherwise, bring together in his mind the phenomena of a burning lamp and the cosmic facts for which he seeks an explanation—is it difficult to imagine his Eureka? At any rate, Heracleitus felt that in the phenomena of combustion he had gained an insight into the ultimate constitution of nature. And he concluded from them that there is no such thing as substance, properly so called, but simply constant movement; the movement is substance. The great solid-seeming cosmos is motion; some of it visible, some of it imperceptible; some of it rising upward to serve as fuel, some of it falling downward, after having fed the flame, to form the constituents of the present world. The motion is constant, the stream ever-flowing: no "thing" is ever at rest, and, if it were at rest, would disappear.

The marvel is that with such scanty data, Heracleitus was able to attain to views which are in truly remarkable harmony with the most advanced theories as to the constitution of matter. Nowadays the very qualities of hardness and impenetrability are being ascribed to motion—to the almost inconceivable rapidity of the whirling of electrons within the system of the atom. Le Bon, for example, in his "Evolution of Matter" and his "Evolution of Forces," contends that atoms are continually breaking down, radium presenting merely an extreme case of a general rule, and that the final product is something which is no longer matter. Robbed of motion, what we call matter disappears! It eludes detection by any methods known to us, and ceases, therefore, so far as we are concerned, to be existent. Atoms, then, according to this modern doctrine, are complex systems of motion; and bodies, all agree, are aggregates of atoms. It seems to follow that the ground of reality, from the point of view of physics, is motion. In short, as Heracleitus taught, the world is the result of ceaseless motion. Tyndall's doctrine of "heat as a mode of motion" is being generalised until it covers the whole field of material phenomena. Or approach the theory of Heracleitus from the side of modern astronomy, the harmony between old and new is equally striking. All substances, said he, spring from fire and to fire they are bound to return. It does not require much special knowledge to realise that this statement contains the pith of the latest theories of the birth and death of worlds. From fire-mist, says the modern astronomer, they were condensed, and to fire-mist, by collisions or otherwise, they will return. What the particular stages may be, what the significance of the nebula;, what the cosmic functions of electricity, and other like problems—may be, and will be, matter for keen debate. But the grand generalisation remains—from fire-mist back again to fire-mist. How modern, also, the grand unity which such a theory gives to existence as a whole. Physics, psychology, sociology, even spiritual facts, all come under the sway of the vast generalisation, because all concerned with the same ultimate Reality. The most striking parallel is found, perhaps, in the doctrine of Energy, which is attracting so much attention at the present time, and of which Ostwald is a champion so doughty. It embodies an attempt to bring into one category the various physical forces together with the phenomena of organic evolution, of psychology, and of sociology in the largest sense. Whether the attempt is successful or not, it is a tribute to the genius of the ancient sage, though it seems to lack that definite element of consciousness, or soul-life, which was so adequately recognised by its great predecessor.

Many other points in the system of Heracleitus are worthy of the closest study. Intensely interesting, for example, is his doctrine that strife is the condition of harmony, and indeed of existence. Schelling reproduced this idea in his well-known theory of polarity; Hegel developed it in his dialectic triad—Thesis, Antithesis, Synthesis; and the electrical theories of matter and force now in vogue fall easily into line with it—not to speak of the dominant theory of evolution as involving a struggle for existence, and as applied in well-nigh all departments of enquiry and research. But it is enough to have grasped the central principle of Fire-motion to prove that the phenomena of fire have had an influence in the development of man's intellectual and spiritual life—an influence which cannot easily be exaggerated. Heracleitus claims an honoured place in the line of nature-mystics.

CHAPTER XXVIII

FIRE AND THE SUN

There can be no doubt, as already stated, that, of all physical phenomena, fire had the most marked effect upon the imagination of primitive man. He saw that it was utterly unlike anything else known to him, both in its properties and in its action. If of anything a divine nature could be predicated, it was fire—the standing miracle—at once destroying and life-giving—material and immaterial—pre-eminently an agent with strange and vast powers, known and unknown. For many objects and institutions a divine origin was sought; it could not fail to be the case with fire. Even the poor Tasmanian natives felt it could not be a thing of earth, and told each other how it was thrown down like a star by two black fellows who are now in the sky, the twin stars, Castor and Pollux. A great gap separates this simple tale from the elaborate Prometheus myth, and yet the same essential features appear in both: and between the two are found a varied series of stories and legends, belonging to many climes and ages, which ring the changes on the same fundamental ideas. The whole of the ancient world believed that the origin of fire must be divine. And the various steps can be clearly traced by which the worship, originally accorded to the nature-power itself, was transferred to a spirit behind the power, and centred at last on the supreme Deity.

For primitive man, as Max Müller well points out, the phenomena of fire would present a dual aspect—on the one hand as a fatal and destructive element, on the other hand, as a beneficent and even homely agency. The lightning would be seen flashing from the one end of heaven to the other, darting down at times to set ablaze the forests and prairies, at times to maim and kill both animals and men. Thus experienced, it would strike terror into the beholders, and impress them with a vivid sense of the presence of spiritual powers. As a late product of the emotions and conceptions thus stimulated, we have the fine myth of the ancient nature goddess, Athene—sprung from the head of Zeus, the austere virgin, who was to become the personification of prudence, self-restraint, and culture, the celestial representative of the loftiest intellectual and spiritual ideals of the Greek world at its best. Hence, too, the group of conceptions which make the lightning and thunderbolts the weapons of the sky, putting them into the hands of the supreme ruler, and making them at last the symbols of law and order. "Out of the fire" (says Ezekiel) "went forth lightning." "Out of the throne" (says the seer of the Apocalypse) "went forth lightnings."

In strong contrast is the beneficent aspect of fire, which, once known and "tamed," becomes almost a necessity for human life. It affords new protection against the cold, makes man peculiarly the cooking animal, and above all establishes the family hearth with all that is meant by "home." Of more distinctly utilitarian import are the uses of fire in fashioning tools and instruments, and the smelting of metals. And it is significant to note that man's use of fire almost certainly owed its origin to his emotional attitude towards it, culminating in worship. As many anthropologists have pointed out, the fire on the hearth had its unmistakable religious aspect, the result of the feeling of veneration for the "element" of fire before its production or use had been understood. And the kindling of the fire on the hearth was as much a sacrifice to the gods as a means to the cooking of food. Each house became a veritable temple of fire.

Wonderfully instructive, as well as fascinating it is to trace the development of the home idea as based on the emotional experiences stimulated by the mystic influences of fire. Each house, as was just stated, was regarded as a temple of the divine element; but the common house, the tribe house, was specially singled out for this honour, and became a temple properly so-called. When bands of citizens set out to found colonies in strange lands, they took with them glowing embers from the tribal or national hearth, as AEneas brought with him to Italy the sacred fire of Troy. Until lately, we are told, the German peasant just married would take to his new home a burning log from the family hearth.