of the Valley Dor twenty-three million years ago, as some believe, perhaps elsewhere. For countless ages the fruit of this tree underwent the gradual changes of evolution, passing by degrees from true plant life to a combination of plant and animal. In the first stages, the fruit of the tree possessed only the power of independent muscular action, while the stem remained attached to the parent plant; later, a brain developed in the fruit, so that hanging there by their long stems they thought and moved as individuals. Then, with the development of perception came a comparison of them; judgments were reached and compared, and thus reason and the power to reason were born upon Barsoom.

"Ages passed. Many forms of life came and went upon the Tree of Life, but still all were attached to the parent plant by stems of varying lengths. At length, the fruit upon the tree consisted of tiny plant men, such as may now be found reproduced in huge size in the Valley Dor, but still hanging to the limbs and branches of The Tree by the stems which grew from the tops of their heads.

"The buds from which the plant men blossomed resembled large nuts about a foot in diameter, divided by double partition walls into four sections. In one section grew the plant man, in another a six legged worm, in the third the progenitor of the white ape, and in the fourth the primeval human of Barsoom. When the bud burst, the plant man remained dangling at the end of his stem; but the three other sections fell to the ground, where the efforts of their imprisoned occupants to escape sent them hopping about in all directions.

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