Mrs. Jaggar and I were returning to Hawaii from a trip to Nova Scotia, and the Matson steamer _Lurline_ took us to the Kona coast toward the end of the 1950 eruption, for inspection of the glowing flows late at night. They looked like hot coals extending far up the mountainside under the clouds, with occasional bright flares where trees burst into flame. Visible motion there was none, as we were too late for the rapid flowing and too far away to see detailed motion. This eruption resembled the voluminous flow of Mauna Loa in 1868, from a low vent at the south end of the mountain, and lasted only a short time after preliminary summit outbursts. The similarity was a big earthquake series, and this was to happen again in Kona in 1951. The cataclysmal opening of the southwest rift in the nineteenth century eruption followed a quarter century of northern outflows, those from 1843 to 1859. Next came those from 1929 to 1952 in the twentieth century. The 1929 earthquakes subterraneously began the northern series. The same argument applies to the twenty-six years of summit and southern outflows, from 1903 to 1929, which followed a quarter century of alternations north and south. None of this takes account of all the summit crater outbreaks, the hinge line between the jostlings of the north and south rift sectors. Roughly the whole argument centers about a supposed rocking of the Mauna Loa mountain sectors, northward and southward from the crater. The two rifts become stiff and seal up for twenty-five years, and then break open for a new period of looseness. The summit well is somehow full always. A remarkable event, namely repose of Kilauea for eighteen years after 1934, may be another reaction. The previous excitement was the buildup, collapse, and recovery of the mountain for the quarter century preceding 1934, with its culmination the steam blast in 1924 of underground water, the dormancy of Kilauea beginning ten years later. Kilauea in 1790 had a bigger explosive eruption, and was in repose for eighteen years beginning ten years thereafter, namely in 1800. Thus it seems likely that Kilauea executes quarter centuries of crisis in its own right. These times are not exact, but are approximations of scientific search for order in a big machine, the Hawaiian volcanic system, where rhythmic pulsations exist wherever gravity operates. A third of a century may prove more exact than the estimate of a quarter century. The end of this 1940 decade completes a half century of my experience of volcanoes and earthquakes, dwelling with a single crater, and learning that volcanoes and earthquakes are tied together. They appear tied to deep ruptures 2,000 miles long, in the thick shell of the earth over a white hot liquid core.