The 996th Lecture to be given before the Society and the 26th Main Lecture to be held at a Branch of the Society, was also the First Sir Henry Royce Memorial Lecture inaugurated by the Derby Branch. The Lecture, “ Sir Henry Royce, Bart,” was given by Mr. Ivan Evernden, M.B.E., B.Sc.(Lond.), M.I.Mech.E., M.S.A.E., M.S.I.A., on 1st October 1956 at Derby. Mr. A. A. Rubbra, F.R.Ae.S., Chairman of the Derby Branch opened the Meeting and Dr. E. S. Moult, B.Sc.(Eng.), F.R.Ae.S., Vice-President of the Society, presided for the rest of the meeting.