AN ordinary Meeting of the Institution of Structural Engineers was held at 11, Upper Belgrave Street, London, S.W.l, on Thursday, 25th February, 1943, when a paper entitled "Highway Road Tunnel under the Maas, Rotterdam,” was presented by Dr. K.W. Mautner, M.I.Struct.E: Mr. W.K. Wallace, M.Inst.C.E., M.I.Struct.E. (President), was in the Chair. A large number of guests attended the meeting; including members of the Royal Netherlands Institution of Engineers. Amongst the distinguished guests was His Excellency the Netherlands Minister of War, who was Minister of Public Works at the time of the preliminary work for the Maas Tunnel. Besides being Minister of War at present, Jhr. van Lidth de Jeudz is also Chairman of the Royal Netherlands Institution of Engineers.