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The larger fragments commonly fall near their place of origin, and usually furnish the principal part of the material of which craters are built, but the gravel-like kernels, lapilli, may be carried laterally several miles if a wind is blowing, while the dust is frequently showered down on thousands of square miles of land and sea.
Clodd, remarking upon this fact, adds: "Thus, then, is explained the tawny color of the larger animals that inhabit the desert; the stripes upon the tiger, which parallel with the vertical stems of bamboo, conceal him as he stealthily nears his prey; the brilliant green of tropical birds; the leaf-like form and colors of certain insects; the dried, twig-like form of many caterpillars; the bark-like appearance of tree-frogs; the harmony of the ptarmigan's summer plumage with the lichen-colored stones upon which it sits; the dusky color of creatures that haunt the night; the bluish transparency of animals which live on the surface of the sea; the gravel-like color of flat-fish that live at the bottom; and the gorgeous tints of those that swim among the coral reefs."
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