IN the discussion on relativity at the Royal Society on February 5 (NATURE, February 12), Mr. Jeans stated that the FitzGerald-Lorentz contraction theory presented grave difficulties in the case ...

Fitzgerald 6 08603 E 1887 Michelson-Morley 7 09063 H Electron Theory Of Length Contraction 8 09773 H ... 30-32 and 39-42 are superb - Einstein and Lorentz on rail cars with clocks and meter sticks.