He
proved that the eggs of diseased moths produced unhealthy worms, and he
advised that the eggs of each moth be kept apart, until the moth was
examined for germs. If these were found, the eggs were to be burned.
Thus the eggs of unhealthy moths were never hatched, and artificial
selection of healthy stock stamped out a disease, and saved a great
industry.
Each individual plant in the struggle for life has only itself to
maintain. In the higher forms of animal life, each animal has its
offspring as well as itself to maintain. In a state of nature, that is
in a state unaffected by man's rational interference, defective
offspring and weaker brethren were the victims of the inexorable law of
natural selection. When Christ gave _his_ reply to the question, "Am I
my brother's keeper?" the defective and the weakling became the special
care of their stronger brother. They constituted thenceforth The Fit
Man's Burden. The work a man has to do during life, in order to support
himself, is the unit of measurement of the burden he has to bear. Many
factors in modern times have helped to reduce that work to a minimum.
The invention of machinery has multiplied his eyes, his hands, his feet;
and one man can now produce, for his own maintenance and comfort, what
it took perhaps a score of men to produce even a century ago.
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