Enjoying the savant's bewilderment, Sajipona described more of the cave's wonders. Her forefathers, she said, had discovered a way to imitate the changes from day to night by a simple process of veiling and unveiling the ball of radium. This was found necessary in order to create the right variations between growth and a state of rest in vegetation. When circumstances made it desirable to use the cave as a permanent habitation, it was found that this variation from light to darkness was indispensable to human welfare. Without it there could be little of the happiness that comes from the storing up and the subsequent expenditure of human energy. Discovering this, certain wise Indians among the cavemen of the past made further experiments in the regulation of light and heat. Among other things, these pioneers in a new science found that the color rays emanating from radium had different properties--some being more life-giving than others--and that by controlling these rays it was possible to create and develop various kinds of subterranean plants. They firmly believed, also, that by working along these lines it would be possible to arrive at new animal forms. Some remarkable experiments were made in this direction, but the results were too indefinite for practical purposes. The whole problem was therefore abandoned years ago, its unpopularity having been increased by the religious prejudice excited against it. This intrusion of what he regarded as blind superstition upon the profitable labors of science incensed Leighton, who muttered imprecations on the idolatries of barbarians. But in this he was checked by Sajipona, who declared that the religious beliefs of her people were in no sense more idolatrous than many of the beliefs current in the outside world. They had their fantastic legends, it is true--like the story of the god who, through the ascendancy of an evil rival, had been imprisoned for ages at the bottom of the Sacred Lake, whence he had been released by the prayers and sacrifices of his followers. Such legends the more enlightened regarded purely as fables, within which were conveyed certain truths that were of lasting value to mankind. The ignorant probably failed to recognize these truths underneath their coverings of legend. But it was not merely the ignorant, it was those who possessed a higher religious sense who were revolted by the effort to create animal life through artificial means. This feeling of antagonism arose simply because in the last of the experiments attempted by the Indian wise men, certain forms were developed, giving feeble signs of life, and indicating unmistakably that if they were ever endowed with a complete, independent existence, they would become a race of malevolent beings, a menace to all existing institutions and peoples. Hence, these wise men were counseled by the more practical and simple-minded of their contemporaries to abandon the