Those who refuse to admit the possibility of "action at a
distance," who insist on inventing a connecting material medium between
every observed effect and some material object with which it seems to be
in causal connection, will, I suppose, have to be allowed to exercise
their ingenuity in any way to satisfy their minds, even though they may
have to revise their theory with every fresh discovery in optics or
radioactivity.
There are many other ingenious mental devices, like this of the ether,
which seem to me only materialistic efforts to postpone or to dodge the
real vital lessons to be read from natural phenomena,--efforts to push
the real Cause back one step farther into the shadow,--a last desperate
effort, in the face of the constantly accumulating evidence of modern
knowledge that the great First Cause is far more intimately connected
with life and motion than many are willing to believe. We have already
mentioned gravity and the other attractive forces, such as cohesion and
adhesion; but seemingly very few people have ever paused to consider how
utterly inexplicable they still remain in any physical or materialistic
sense.
It is easy to explain any form of a _push_ in a physical way; but
gravity is _not a push but a pull_.
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