THE centenary commemorations of the death of Richard Trevithick will be held on April 22, 23 and 24. On Saturday afternoon, April 22, a demonstration will be held at Camborne, where Trevithick made his first experiments with a steam road carriage, and on Sunday afternoon a memorial service will be held in the Tregajorran Methodist Chapel, in the parish of Illogan, Cornwall, his birthplace. On Sunday morning a memorial service will be held at 11 a.m. in Dartford Parish Church, Kent, where the preacher will be the Right Rev. the Lord Bishop of Rochester. At the close of this service an address on Trevithick will be given by Mr. L. St. L. Pendred, and a wreath will be placed on the memorial which recalls Trevithick's death at the Bull Inn, Dartford, on April 22, 1833. At evensong at 3 p.m. in Westminster Abbey on Sunday, special reference will be made to the centenary by the preacher, the Ven. Archdeacon V. F. Storr, and at the end of the service a chaplet will be placed beneath the Trevithick window in the north aisle of the Abbey. Finally, on Monday, April 24, at 6 p.m., a memorial lecture will be delivered by Prof. C. E. Inglis, at the Institution of Civil Engineers, Great George Street, S.W.I, by kind invitation of the Council. The chair will be taken by Sir Murdoch Macdonald.