Abstract
MR. LEIGH PAGE has given a very simple method of treating the motion of high-speed particles in a gravitational field on Einstein's theory (NATURE, February 26, p. 692). In one respect his results differ from those which have been obtained by more laborious methods, and I think that some error must have crept in, either through a failure of his approximation or from some other cause. He finds that a particle travelling with the velocity of light would be undetected, whereas a ray of light is deflected. It would be difficult to reconcile this with the principle of equivalence, which seems to require that the trajectory of a material particle should approach that of a light-pulse as the velocity approaches that of light.
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