Time, Space and Gravitation, by Prof. Einstein 88 Einstein's Law of Gravitation, by Prof. J. S. Ames 93 The Deflection of light by Gravitation and the Einstein Theory of Relativity, by Sir Frank Dyson, Prof. A. S. Eddington and Sir J. J. Thomson 112 NEWTON "Newton was the greatest genius that ever existed."--Lagrange, one of the greatest of French mathematicians. "The efforts of the great philosopher were always superhuman; the questions which he did not solve were incapable of solution in his time."--Arago, famous French astronomer. EINSTEIN "This is the most important result obtained in connection with the theory of gravitation since Newton's day. Einstein's reasoning is the result of one of the highest achievements of human thought."--Sir J. J. Thomson, president of the British Royal Society and professor of physics at the University of Cambridge. "It surpasses in boldness everything previously suggested in speculative natural philosophy and even in the philosophical theories of knowledge. The revolution introduced into the physical conceptions of the world is only to be compared in extent and depth with that brought about by the introduction of the Copernican system of the universe."--Prof. Max Planck, professor of physics at the University of Berlin and winner of the Nobel Prize. I NEWTON In speaking of Newton we are tempted to paraphrase a line from the Scriptures: Before Newton the Solar System was without form, and void; then Newton came and there was light. To have discovered a law not only applicable to matter on this earth, but to the planets and sun and stars beyond, is a triumph which places Newton among the super-men. What Newton's law of gravitation must have meant to the people of his day can be pictured only if we conceive what the effect upon us would be if someone--say Marconi--were actually to succeed in getting into touch with beings on another planet. Newton's law increased confidence in the universality of earthly laws; and it strengthened belief in the cosmos as a law-abiding mechanism.