The germ of the corn kernel, once discarded in the manufacture of
starch, now yields a popular table oil. From tomato seeds, one of the
waste products of the canning factory, can be extracted 22 per cent. of
an edible oil. Oats contain 7 per cent. of oil. From rape seed the
Japanese get 20,000 tons of oil a year. To the sources previously
mentioned may be added pumpkin seeds, poppy seeds, raspberry seeds,
tobacco seeds, cockleburs, hazelnuts, walnuts, beechnuts and acorns.
The oil-bearing seeds of the tropics are innumerable and will become
increasingly essential to the inhabitants of northern lands. It was the
realization of this that brought on the struggle of the great powers
for the possession of tropical territory which, for years before, they
did not think worth while raising a flag over. No country in the future
can consider itself safe unless it has secure access to such sources. We
had a sharp lesson in this during the war. Palm oil, it seems, is
necessary for the manufacture of tinplate, an industry that was built up
in the United States by the McKinley tariff.
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