THE Royal Society will, if circumstances permit, celebrate, at its anniversary meeting on November 30, the tercentenary of the birth of Sir Isaac Newton. The programme, which will be a modest one owing to the War, is to include three lectures, to be delivered in the Society's apartments at Burlington House, Piccadilly, on “Newton and the Science of his Age”, by Prof. E. N. da C. Andrade, Quain professor of physics in the University of London ; “Newton as an Experimenter”(with demonstrations), by Lord Rayleigh, emeritus professor of physics in the Imperial College of Science and Technology ; and “Newton and the Science of To-day”, by Sir James Jeans, professor of astronomy in the Royal Institution of Great Britain.