HEARTY congratulations are extended to Prof. W. Mitchinson Hicks, who celebrated his eightieth birthday on Tuesday last, Sept. 23. Born at Launceston, he was educated at a private school in Devonport, proceeding thence to St. John's College, Cambridge, being placed seventh wrangler in 1873. Prof. Hicks was principal of and professor of physics in the University of Sheffield from 1883 until 1905. At the Ipswich meeting of the British Association in 1895 he was president of Section A (Mathematics and Physics). The Royal Society awarded him a Royal medal in 1912, during the presidency of Sir Archibald Geikie, for his researches in mathematical physics, and especially for his investigations on the theory of spectroscopy. Among researches specially associated with his name may be mentioned those on hydrodynamics, and particularly on vortex motion, published in the Psophical Transactions. Prof. Hicks was elected a fellow of the Royal Society in 1885, and has served on the council on several occasions.