Not the green of the great mass, nor of the queer periphery, nor of uninspired devilgrass. It was a green unknown in living plant before; a glassy, translucent green, the green of a cathedral window in the moonlight. By contrast, the widening circle about it seemed subdued and orderly. The fantastic shapes, the tortured writhings, the unnatural extensions into the ocean were no longer manifest, instead, for miles around the ravaged spot where the bomb had been dropped, the grass burst into bloom. Purple flowers appeared--not the usual muddy brown, faintly mauve--but a redviolet, brilliant and clear. The period of generation was abnormally shortened; seed was borne almost instantly--but the seed was a sport. It did not droop and detach itself and sink into the ground. Instead, tufted and fluffy, like dandelion seed or thistledown, it floated upward in incredible quantities, so that for hundreds of miles the sky was obscured by this cloud bearing the germ of the inoculated grass. It drifted easily and the winds blew it beyond the confines of the creeping parent. It lit on spots far from the threatening advance and sprouted overnight into great clumps of devilgrass. All the anxiety and panic which had gone before was trivial in the face of this new threat. Now the advance was no longer calculable or predictable; at any moment a spot apparently beyond danger might be threatened and attacked. Immediately men remembered the exotic growth of flowers which came up to hide some of London's scars after the blitz and the lush plantlife observed in Hiroshima. Why hadnt the allwise scientists remembered and taken them into account before the bomb was dropped? Why had they been blind to this obvious danger? Fortunately the anger and terror were assuaged. Observers soon discovered the mutants were sterile, incapable of reproduction. More than that: though the new clumps spread and flourished and grew rapidly, they lacked the tenacity and stamina of the parent. Eventually they withered and dwindled and were in the end no different from the uninoculated grass. Now a third change was seen in the color band. The green turned distinctly blue and the sharp line between it and the rest of the weed vanished as the blueness shaded out imperceptibly over miles into the green. The barren spot made by the bomb was covered; the whole mass of vegetation, thousands of square miles of it, was animated by a surging new vigor, so that eastward and southward the rampant tentacles jumped to capture and occupy great new swaths of territory.