Wonderfully restful is the dream life of the winterless seas of the coral caves, and yet even to-day fierce floods of boiling lava sometimes find their way over the seashore and down over the reefs, destroying the life of sea-moss and coral polyps, and surrounding shells and fish and crawling slugs or swift-moving eels with floods of turbid, boiling, death-dealing water in place of the clear waves through which they had been accustomed to journey.
Each island has its individual extinct craters, but no island has any form of hot geyser action such as characterizes the Yellowstone Park of the United States, or the region around Rotorua, New Zealand. The nearest approach to a geyser deposit such as abounds in central Mexico is found on Molokai and around the small crater Leahi (Diamond Head), near Honolulu. Leahi was evidently forced up through coral reefs and the mighty heat produced small layers of geyser-like deposits.
The islands have been built up by lava alone. This lava rapidly falls to pieces under the influence of sunlight and rain, thus permitting [[xiv]]plants, such as giant ferns, small shrubs and grasses, to take root. These plants break up the fire-rock very rapidly and send seeds broadcast to multiply soil-making activities. Thus a lava flow in a few years becomes the foundation for a growing forest.
The fire-rock, breaking through the floor of the ocean to form the Hawaiian chain of islands, lost its power first in the far northwest and cooled and hardened from island to island until it is now making its last appearance on the largest and most southeasterly of all the group, the island known by the name Hawaii. Here is still to be found what is called the largest active crater in the world, Kilauea, and the sister crater, Mokuaweoweo, from which come the most voluminous lava flows, the latest one being in May, 1916. Kilauea is about 4,000 feet altitude, while Mokuaweoweo is nearly 10,000 feet higher and is on the summit of Mauna Loa. Professor Jaggar, the experienced volcanologist in charge of an observing station on the brink of Kilauea, accepts the theory of a gas connection between these two craters so that their activity is mutual as to foam vents, but not so close that the lower volcano affords a hydrostatic outlet to the lava in the higher crater.
In this place it is well to note a fact which [[xv]]makes the scientific study of the active fire-lake of living volcanoes a very valuable index of coming events. Professor Jaggar says: “It has long been known that the crust of our rocky globe rises and falls with a tide similar to that of the ocean. From direct experiment professors of Chicago University have recently proved a tidal movement in the solid earth up and down of about a foot twice each day, and varying in amount through the lunar month and the solar year. There is definitely a daily movement marked in the lava level of the fire-pit of Kilauea, and there is a marked semi-annual high level.” This scientific study of active craters is still in its infancy and promises, as Professor Jaggar says, “to create a new science in which we may hope at some not distant day to predict the periods of volcanic eruptions and earthquakes.”
The early Hawaiians incorporated in their legends various theories to explain these great phenomena of nature, many of which are included in this volume, especially those legends which cluster around Pele, the great goddess of fire, and Hiiaka, her sister, goddess of lightning. Other interesting legends relating to the once active but long extinct crater Haleakala, on Maui, may be found in “Legends of Maui.” [[1]]