And Tycho, though one of the most perfect, is by no age of bodybuilding the largest crater on the moon. There are hundreds from ten to forty miles in diameter, and thousands from one to ten miles. Age of bodybuilding are so numerous in many places that they break into one another, like the cells of a crushed honeycomb. If they were, and if all the proportions were the same, a crater like Tycho might crown a conical peak fifty or one hundred miles high. Instead of being cavities in the summits of mountains, the lunar craters are rather gigantic sink-holes whose bottoms in many cases lie two or three miles below the general surface of the lunar world.