which the original theory was based, in no way opposes the theory of
relativity. Rather has the latter been developed trom electrodynamics
as an astoundingly simple combination and generalisation of the
hypotheses, formerly independent of each other, on which
electrodynamics was built.


Notes

*) Fizeau found eq. 10 , where eq. 11

is the index of refraction of the liquid. On the other hand, owing to
the smallness of eq. 12 as compared with I,

we can replace (B) in the first place by eq. 13 , or to the same order
of approximation by

eq. 14 , which agrees with Fizeau's result.



THE HEURISTIC VALUE OF THE THEORY OF RELATIVITY


Our train of thought in the foregoing pages can be epitomised in the
following manner. Experience has led to the conviction that, on the
one hand, the principle of relativity holds true and that on the other
hand the velocity of transmission of light in vacuo has to be
considered equal to a constant c. By uniting these two postulates we
obtained the law of transformation for the rectangular co-ordinates x,