THE following is a preliminary report of an investigation performed to test directly, in a terrestrial experiment, the second postulate of special relativity, which states that the velocity of light ...

Mathematics is distinguished from the sciences by the freedom it enjoys in choosing basic assumptions from which consequences can be deduced by applying the laws of logic. We call the basic ...

EVERY physicist is greatly indebted both to Prof. Bohr for committing to paper, and to NATURE for printing, the admirable account of the new wave mechanics entitled “The Quantum Postulate and the ...