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196 scientist, consume the deadly gases and liberate oxygen. It is because of this even more than for the light they give that they are used exclusively throughout Minuni. Even our domes would be dark, ill-smelling, noxious places were it not for them, while the quarries would be absolutely un­workable."

"Then I shall not wait for them to be extin­guished," said Tarzan, stretching himself at full length upon the dirt floor, with a nod and a "Tuano!"—a Minunian "Good night!"—to Talaskar and Komodoflorensal.