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282 limited by the condition that the total charge on a system of particles is invariant. This is expressed analytically by the equation

provided the axes form a right-handed system in each case.

If the transformation is such that the integral equations of the theory of electrons are invariant, we must have

where $$\theta$$ is a constant.

These relations give two sets of equations connecting the quantities $$E_{x},\dots,H_{x},\dots$$ with $$E'_{x},\dots,H'_{x},\dots$$ viz.,

In order that these equations may be equivalent to one another we must