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Author's Supplementary Remarks THE question of vibration is apparently exercising many minds at present, and since the time when my text was completed, further information has reached me from various quarters which enables me to add many items to the bibliography of the subject, such as was published in "Science et Industrie" of February, 1934, and to which I had referred our colleagues. This new list contains some fifty references, and is embodied as a note at the end of the discussion. It is not claimed that it is complete, but it is fairly up to date, and a good many new points have been brought out.
Sir,-It has long been known that the modulus of elasticity in compression of concrete increases with the quality of the concrete and this has been recognised in the New Code.
Mr. HAMANN, when introducing the paper, took the opportunity to express his gratitude to Mr. Robert Campbell, B.Sc.(Eng.), A.M.Inst.C.E., consulting engineer, of New Zealand, to whom he owed the knowledge he had gained of earthquake effects. Mr. Campbell was formerly Professor of Civil Engineering at Canterbury (N.Z.) University College, and was a member of the New Zealand Building Regulations Committee, which had issued a report in June, 1931, only four months after the disastrous earthquake which had occurred in New Zealand that year. The committee had been re-assembled, and Mr. Campbell was one of its two technical officers, Mr. Hamann added that he had gained knowledge of the subject during the period in which he had assisted Mr. Campbell.