SIDELIGHTS ON RELATIVITY

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questions addressed to me prove that the requirements of those who
thirst for knowledge of these matters have not yet been completely
satisfied.

So, will the initiated please pardon me, if part of what I shall
bring forward has long been known?

What do we wish to express when we say that our space is infinite?
Nothing more than that we might lay any number whatever of bodies
of equal sizes side by side without ever filling space. Suppose
that we are provided with a great many wooden cubes all of the
same size. In accordance with Euclidean geometry we can place them
above, beside, and behind one another so as to fill a part of space
of any dimensions; but this construction would never be finished;
we could go on adding more and more cubes without ever finding
that there was no more room. That is what we wish to express when
we say that space is infinite. It would be better to say that space