Mr. Francis Galton avows himself a qualified believer in the possibility of signaling to Mars. Accepting as a fact that the Lick telescope can bring the planet optically to within 50,000 miles, he has found that a reflected beam of sunlight, sent through a hole one tenth of an inch square, is visible as a glint at a distance often miles. Hence, with fairly clear atmospheres, the flash from many mirrors simultaneously, whose aggregate width is fifteen yards and their aggregate length, say, to allow for slope, twenty-five yards, would be visible in Mars, if seen through a telescope such as that at the Lick Observatory. "With funds and goodwill there seems no insuperable difficulty in flashing from a very much larger surface than the above, and sending signals that the inhabitants of Mars, if they have eyes, wits, and fairly good telescopes, would speculate on and wish to answer. One, two, three, might be slowly flashed over and over again from us to them, and possibly in some years, to allow time for speculation in Mars to bear fruit, one, two, three might come back in response." The remarkable pit of the Creux de Souci, France, is situated in a sheet of recent basalt on the south side of the Puy de Montchal. The opening is eighty-two feet in diameter and thirty-eight feet deep; but at that depth a hole about ten feet wide communicates with a hollow seventy feet deep, at the bottom of which is a stagnant pool overladen with carbonic acid which forbids access to the water surface. The interior is a vast vaulted hollow, apparently formed in the basalt when semi-fluid, by an explosion of volcanic gas. The temperature falls from 51° Fahr. in the open air to 34° near the water.