There is no rigid distinction of the two worlds.
Many microscopic plants move about just as animals do, and many
animals live on fixed stalks; while many plants feed on organic
matter. There is so little "difference of nature" between the
plant and the animal that the experts differ in classifying some
of these minute creatures. In fact, we shall often find plants
and animals crossing the line of division. We shall find animals
rooting themselves to the floor, like plants, though they will
generally develop arms or streamers for bringing the food to
them; and we shall find plants becoming insect-catchers. All this
merely shows that the difference is a natural tendency, which
special circumstances may overrule. It remains true that the
great division of the organic world is due to a simple principle
of development; difference of diet leads to difference of
mobility.
But this simple principle will have further consequences of a
most important character. It will lead to the development of mind
in one half of living nature and leave it undeveloped in the
other. Mind, as we know it in the lower levels of life, is not
confined to the animal at all.
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