I have recently started an experiment with a thick globe of cement, made with a shell, proportional in thickness to the earth’s crust, which is 1,800 miles deep, as all seismologists agree. Striking this shell with a sledge hammer, I find it breaks in straight lines at right angles to each other. Theory is bound to be influenced by the observational answers derived from watching lava emerging from the mountain rifts, at the end of the long straight belt of rifts of the whole Hawaiian chain. I continually review my own geological muddles, the controversies over steam, flames, volcano swelling, explosion craters, layers in the crust, weighting and underflowing, continental uplift, the globe’s armor plate, contraction wrinkling of basins of sediment, submarine volcanoes, linear chains of volcanoes, siliceous shell, blocks lifted or sunk, planets solar or from the sun’s binary twin, original heat or radioactive heat, thick crust or thin shell, lava reservoirs or lava core, pregeology ancestors of volcanoes, and craters on the moon. The only way to calculate from observations on Hawaiian volcanoes is to copy the mathematicians; namely, to guess at the answers. CHAPTER VII Envoi “_Tho’ world on world in myriad myriads roll round us Each with different powers and other forms of life than ours._” I have spent sixty years in qualitative experiments in geology. I began with old volcanoes and geysers in the Yellowstone and the far west, and ended with experiments on the active Hawaiian volcano, Kilauea. Based on these experiments, I have written books about evolution of craters, and about distinct peculiarities of explosive eruptions from underground water.