SIR PRAFULLA RÂY has retired from the Palit professorship of chemistry at the University College of Science, Calcutta, a post which he has held since 1916, and has been elected professor emeritus. His retirement is a noteworthy event in Indian science. The whole of Sir Prafulla's actïve life has been spent in Calcutta. After receiving his early training in chemistry at the Presidency College under the late Sir Alexander Pedler, he worked for some years in Edinburgh under Prof. Crum Brown, graduating there with the degree of D.Sc. On returning to Calcutta he in due course succeeded Sir Alexander Pedler as professor of chemistry at the Presidency College, where he remained until his retirement from Government service in 1916. Sir Prafulla's own investigations, carried out in collaboration with numerous students, were for many years concerned mainly with the chemistry of the nitrites, to which he made a notable contribution, whilst more recently he has added to our knowledge of thio-compounds and metallic complexes. Sir Prafulla was the first to organize in India a true school of chemistry ; he gathered around him a brilliant band of workers whom he imbued with his own enthusiasm for scientific research. Many of these have attained positions of eminence.