Читать книгу The Belief in Immortality and the Worship of the Dead, Volume 2 (of 3) - Frazer James George - Страница 8

The Tonga or Friendly Islands form an archipelago of about a hundred small islands situated in the South Pacific, between 18° and 22° South latitude and between 173° and 176° East longitude. The archipelago falls into three groups of islands, which lie roughly north and south of each other. The southern is the Tonga group, the central is the Haabai or Haapai group, and the northern is the Vavau group. In the southern group the principal islands are Tongataboo and Eua; in the central group, Namuka and Lifuka (Lefooga); in the northern group, Vavau. The largest island of the archipelago, Tongataboo, is about twenty-two miles long by eight miles wide; next to it in importance are Vavau and Eua, and there are seven or eight other islands not less than five miles in length. The rest are mere islets. Most of the islands are surrounded by dangerous coral reefs, and though the soil is deep and very fertile, there is a great lack of flowing water; running streams are almost unknown. Most of the islands consist of coral and are very low; the highest point of Tongataboo is only about sixty feet above the level of the sea.128 However, some of the islands are lofty and of volcanic formation. When Captain Cook visited the islands in 1773 and 1777 there was apparently only one active volcano in the archipelago; it was situated in the small island of Tufoa, which lies to the west of Namuka. Cook saw the island smoking at the distance of ten leagues, and was told by the natives that it had never ceased smoking in their memory, nor had they any tradition of its inactivity.129 In the hundred and fifty years which have elapsed since Cook's time volcanic action has greatly increased in the archipelago. A considerable eruption took place at Tufoa in 1885: the small but lofty island of Kao (5000 feet high) has repeatedly been in eruption: the once fertile and populous island of Amargura, or Funua-lai, in about 18° South latitude, was suddenly devastated in 1846 or 1847 by a terrific eruption, which reduced it to a huge mass of lava and burnt sand, without a leaf or blade of grass of any kind. Warned by violent earthquakes, which preceded the explosion, the inhabitants escaped in time to Vavau. The roar of the volcano was heard one hundred and thirty miles off; and an American ship sailed through a shower of ashes, rolling like great volumes of smoke, for forty miles. For months afterwards the glare of the tremendous fires was visible night after night in the island of Vavau, situated forty miles away.130 Another dreadful eruption occurred on the 24th of June 1853, in Niua Foöu, an island about two hundred miles to the north-north-west of Funua-lai. The entire island seems to be the circular ridge of an ancient and vast volcano, of which the crater is occupied by a lake of clear calm water. On the occasion in question the earth was rent in the centre of a native village; the flames of a new volcano burst forth from the fissure, belching a sea of molten lava, under which ten miles of country, once covered with the richest verdure, have been encased in solid rock, averaging from eight to fifteen feet in thickness. The lake boiled like a cauldron, and long after the more powerful action of the volcano had ceased, the waters of the lake were often rent by tongues of flame, which shot up from them as well as from the clefts in the surrounding precipices.131 In the island of Late, lying to the west of Vavau, a new volcano broke out with great violence in 1854; the roar of the volcano was heard at Lifuka, fifty miles away; the immense pillar of smoke was visible by day and the fire by night. The central portion of one side of the mountain (about 2500 feet high) was completely blown out by the explosion.132

But not only have new volcanoes appeared or long extinct volcanoes resumed their activity within the last century in the existing islands, new islands have been formed by volcanic action. One such island, emitting volumes of fire, smoke, and steam, issued from the surface of the sea, and was discovered by the missionary ship John Wesley in August 1857; its appearance had been heralded some years before by a strange agitation of the sea and by fire and smoke ascending from the water. This new volcanic island lies about midway between the two other volcanic islands of Tufoa and Late.133 A third new volcanic island seems to have been formed to the south of Tufoa in 1886.134 Another new island was thrown up from the sea about the beginning of the twentieth century; it was partly washed away again, but has again materially increased in size.135 It is noteworthy that the volcanoes, new or old, all occur in a line running roughly north and south at a considerable distance to the west of, but parallel to, the main body of the Tongan archipelago. They clearly indicate the existence of submarine volcanic action on a great scale. Even in the coralline islands traces of volcanic agency have come to light in the shape of pumice-stones, which have been dug out of the solid coral rock at considerable depths.136 In the lofty island of Eua an extensive dyke of basalt is found inland underlying the coral formation.137

These facts lend some countenance to the view that the whole archipelago forms the summit or visible ridge of a long chain of submarine volcanoes, and that the islands, even those of coralline formation, have been raised to their present level by volcanic action.138 That very acute observer, Captain Cook, or one of the naturalists of the expedition, noticed that in the highest parts of Tongataboo, which he estimated roughly at a hundred feet above sea-level, he often met with "the same coral rock, which is found at the shore, projecting above the surface, and perforated and cut into all those inequalities which are usually seen in rocks that lie within the wash of the tide."139 Again, on ascending the comparatively lofty island of Eua, Captain Cook observes: "We were now about two or three hundred feet above the level of the sea, and yet, even here, the coral was perforated into all the holes and inequalities which usually diversify the surface of this substance within the reach of the tide. Indeed, we found the same coral till we began to approach the summits of the highest hills; and, it was remarkable, that these were chiefly composed of a yellowish, soft, sandy stone."140 In the island of Vavau it was remarked by Captain Waldegrave that the coral rock rises many feet above the present level of the sea, and he adds: "The action of fire is visible on it, and we saw several instances of its crystallisation."141

The view that even the coralline islands of the Tongan archipelago have been elevated by volcanic agency is not necessarily inconsistent with Darwin's theory that coral reefs are formed during periods of subsidence, not of elevation;142 for it is quite possible that, after being raised ages ago by volcanic forces, these islands may be now slowly subsiding, and that it has been during the period of subsidence that they have become incrusted by coral reefs. Yet the occurrence of coral rocks, bearing all the marks of marine action, at considerable heights above the sea, appears indubitably to prove that such a general subsidence has been in some places varied by at least a temporary elevation.

In thus postulating elevation by volcanic action, as well as subsidence, to explain the formation of the Tongan islands I am glad to have the support of a good observer, the late Rev. Dr. George Brown, who spent the best years of his life in the Pacific, where his experience both of the larger and the smaller islands was varied and extensive. He writes: "I have seen islands composed of true coralline limestone, the cliffs of which rise so perpendicularly from the blue ocean that the natives have to ascend and descend by ladders in going from the ocean to the top, or vice versa. A large steamer can go so close to some of these cliffs that she could be moored alongside of them in calm weather. It is not at all improbable, I think, that in these islands we have the two factors in the formation of islands, viz. subsidence, during which these immense cliffs were formed, and subsequent upheaval. This is the only way, I think, in which we can account for these perpendicular cliffs in the midst of deep blue ocean."143

I have dwelt at what may seem undue length on the volcanic phenomena of the Tonga islands because the occurrence of such phenomena in savage lands has generally influenced the beliefs and customs of the natives, quite apart from the possibility, which should always be borne in mind, that man first obtained fire from an active volcano. But even if, as has been suggested, the Tonga islands formed the starting-point from which the Polynesian race spread over the islands of the Pacific,144 it seems very unlikely that the Polynesians first learned the use of fire when they reached the Tongan archipelago. More probably they were acquainted, not only with the use of fire, but with the mode of making it long before they migrated from their original home in Southern Asia. A people perfectly ignorant of that prime necessity could hardly have made their way across such wide stretches of sea and land. But it is quite possible that the myth which the Tongans, in common with many other Polynesians, tell of the manner in which their ancestors procured their first fire, was suggested to them by the spectacle of a volcano in eruption. They say that the hero Maui Kijikiji, the Polynesian Prometheus, first procured fire for men by descending into the bowels of the earth and stealing it from his father, Maui Atalanga, who had kept it there jealously concealed.145