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which the world of sense itself is the suggestion and justi-

Far be it from me, however, to wish to fix you immov-
ably in this or in any other theoretic conception. With
all our belief of it, it will be well to keep the theory plastic
and capable of change. You may, moreover, urge that
although the phenomena occur as the medium existed,
the absolute demonstration of its existence is still wanting.
Far be it from me to deny to this reasoning such validity
as it may fairly claim. Let us endeavor by means of anal-
ogy to form a fair estimate of its force. You believe that
in society you are surrounded by reasonable beings like
yourself. You are perhaps as firmly convinced of this as
of any thing. What is your warrant for this conviction ?
Simply and solely this, your fellow-creatures behave as if
they were reasonable; the hypothesis, for it is nothing
more, accounts for the facts. To take an eminent example:
you believe that our President is a reasonable being. Why ?
There is no known method of superposition by which any
one of us can apply himself intellectually to another so as
to demonstrate coincidence as regards the possession of
reason. If, therefore, you hold our President to be reason-
able, it is because he behaves as if he were reasonable. As
in the case of the ether, beyond the “ as ” you cannot go.
Nay I should not wonder if a close comparison of the data
on which both inferences rest, caused many respectable
persons to conclude that the ether had the best of it.

This universal medium, this light-ether as it is called, is
a vehicle, not an origin of wave-motion. It receives and
transmits, but it does not create. Whence does it derive
the motions it conveys ? For the most part from luminous
bodies. By this motion of a luminous body I do not mean
its sensible motion, such as the flicker of a candle, or the
shooting out of red prominences from the limb of the sun.
I mean an intestine motion of the atoms or molecules of

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