In fact, to apply the law of relativity in all its rigour, it must be applied to the entire universe ... our law of relativity may be enunciated as follows:--The readings that we can make with our instruments at any given moment will depend only on the readings that we were able to make on the same instruments at the initial moment. ... If the law is true in the Euclidean interpretation, it will be also true in the non- Euclidean interpretation. ... [p. 79] To sum up, whichever way we look at it, it is impossible to discover in geometric empiricism a rational meaning.
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Published before 1923