Our Friends And Our Foes of the Invisible World How to Woo the Friends How to

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Some fishes in dark caves have no eyes. Before introduced to the caves, their eyes were well de- veloped. Once in the darkness, they could not use their eyes. Their eyes dwindled, vanished.
In the evolution of the lower animals, as higher and higher species are evolved, they do not need certain organs needed and used by the lower 225 226 THE INVISIBLE WORLD species. Unused from generation to generation, these organs gradually shrivel away to mere frag- ments, finally vanish.
In the onward evolu
...tion of Man from the higher animals, with his upright position and new en- vironment, he does not need certain organs needed and largely used by his ancestors. Unused through long generations, these organs, by slow degrees, degenerate into mere rudiments, at last to disappear.
Among many others, the appendix is such an organ, a mere fragment of what it once was in some of Man's remote ancestors.
When these ancestors walked on all fours, the appendix was a part of the caecum, the closed end of that organ.


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