--This danger not
remote.
CONCLUSION p. 124
THE FERTILITY OF THE UNFIT.
* * * * *
INTRODUCTION.
Biology is the Science of Life. It seeks to explain the phenomena of all
life, whether animal or vegetable. Its methods are observation and
experiment. It observes the tiny cell on the surface of an egg yolk, and
watches it divide and multiply until it becomes a great mass of cells,
which group off or differentiate, and rearrange and alter their shapes.
It observes how little organs unfold themselves, or evolve out of these
little cell groups--how gradual, but how unvarying the change; how one
group becomes a bone, another a brain, another a muscle, to constitute
in three short weeks the body of a matured chick. Those little tendons
like silken threads, that run down those slender pink legs to each and
every toe, and move its little joints so swiftly that we hardly see
them--that little brain, no bigger than a tiny seed, in which is planted
a mysterious force that impels it to set all those brand-new muscles in
motion, and to dart after a fly with the swiftness of an arrow--all this
wondrous mechanism, all this beauteous structure, all this perfection of
function, all this adaptation to environment, have evolved from a few
microscopic cells in three short weeks.
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