The ocean voyage has occasionally still another surprise in store for the traveler when he reaches the South Pacific. A squall is a tempest on a small scale. We see in the distance a dark cloud of immense size which seems to ride slowly over the surface of the smooth sea. The gentle breeze gives way to a strong wind, the surface of the water becomes ruffled with whitecaps, the darkness increases, and at irregular intervals the threatening, angry cloud is lighted up by chains of lightning thrown in all possible directions; these flashes are followed by peals of thunder, and by prolonged rumbling, which becomes feebler and feebler, and finally dies away far out on the surface of the ocean. The steamer penetrates the storm area. Darkness prevails. Gigantic drops of rain strike the deck and patter upon the canvas awning, the harbingers of a drenching rain.
And now the thick'ned sky
Like a dark ceiling stood; down rush'd the rain impetuous.
MILTON.
The cloud and darkness are left behind, and a clear sky and smooth sea ahead greet the passengers. Did you ever see a rainbow at midnight? Such an unusual nocturnal spectral phenomenon greeted us in midocean: the full moon in the east, the delicate rainbow in its infinite colors painted on the clouds in the west. Our captain, who had lived on the tropic sea for a quarter of a century, had never seen the like before. It was reserved for us to see a rainbow painted by the moon. With such pleasant diversions, by day and by night, we soon forget the ocean desert, and yet on the last day of the voyage we welcome the sight of land.
Be of good cheer, I see land.
DIOGENES.
The vastness of the ocean and the smallness of Tahiti are in strange contrast. How the mariner, in setting the compass on leaving the harbor of San Francisco, can so unerringly find this little speck in the ocean nearly four thousand miles away, is an accomplishment which no one, not versed in the science of navigation can fully comprehend. We sighted Tahiti during the early part of the forenoon. The peaks of the two highest mountains in Tahiti, Oroheua and Aorii, seven to eight thousand feet in height, projected spectre-like from the surface of the ocean. These peaks appeared as bare, sharp, conical points in the clear sky above a mantle of clouds which enveloped the balance of the island. This misty draping of the two highest mountains takes place almost every day, as the clouds are attracted by the constant moisture of the soil, due to the dense forests and luxuriant tropical vegetation.
The next sight of land brought into view the rugged mountains of Moorea and a group of small atoll islands. Moorea is in plain view from Papeete, and is the second largest of the Society Islands. Before we look at Tahiti at close range, let us examine the group of atoll islands which the steamer passes close enough to give us a good idea of their formation.
THE ATOLL ISLANDS
The atoll islands, so numerous in the South Seas, have a uniform conformation, and are of coral, deposited upon submerged summits of mountains of volcanic origin. The floor of the Pacific, like many other parts of the earth's surface, is undergoing constant changes, increasing or diminishing its level. Here and there, at certain intervals, volcanic eruptions have created mountains, which, in Hawaii, rise to nearly fourteen thousand and, in Tahiti, to over seven thousand feet. Around each of these innumerable islands and islets in the great Pacific Ocean the coral polyps have a fringing reef of rock. As these minute creatures can live only at a depth of twenty to thirty fathoms, and die as soon as exposed to the air, their life-work is confined to the coast of volcanic islands. Whenever, as it often happened, the island upon which they had congregated was slowly sinking, they would elevate their wall to save themselves from death in deep water. It is evident that if this process continued long enough, the land would entirely disappear and leave a submerged circular wall of coral just below the level of the low tide. The effects of the waves in breaking off the coral formation, large and small, in elevating them, would, in course of time, produce a ring of sandy beach, rising above the sea surrounding the central basin, filled with salt water entering through one or many open channels. Upon the beach, cocoanuts, washed ashore, would find a favorable soil for germination, and, ere long, stately palms would fringe the rim of the enclosed lagoon. Every atoll island has a peripheral fringe of cocoa-palms and a central lagoon which communicates with the ocean by one or more channels. Such an island is an atoll, the final stage in the disappearance of a volcanic islet from the surface of the sea. Such islands are numerous in the Society Islands, and the Paumotuan Archipelago consists exclusively of such atoll islands.
VIEW OF MOOREA