To the Editor of the "Norra-Cuina Datny News."
Sir,—I have received many inquiries since Prof, Robertson's lecture for a definition or simple statement of the main idea, Possibly the following will help:—(1) All science depends on measurement, (2) The standards of medsurement are selected units of mass, distance and time.
(3) These units have unti] lately been considered to be mutually independent and to be related to "absolute" measures in unknown but fixed positions.
(4) Lorenz, Einstein and others have shown that, on account of the limit to, and definitive value of, the velocity of light, these units are inextricably interconnected and therefore are not independent of each other.
(5) Absolute mass, space and time therefore transcend conception and all mass, space and time are mutually relative. Ulus is the principle of relativity.
Lam, ete., Shanghai, May 30.
Text read from the printed page and cleaned; old type leaves the occasional error.