deflection of light by the sun assuming a finite speed of light corpuscles and a non-zero mass. (The result, 0.85 arc-sec, was rederived independently by Cavendish and Albert Einstein (1879–1955) (1911), but went unnoticed until 1921. ) 1807 Humphry Davy (1778–1829) 's lecture, "On Some Chemical Agents of Electricity," drawing close