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I comment on the paper 'Structural behaviour of reinforced concrete columns in service'. I would make it clear that I make no claim 'to be competent to judge the quality of the authors' work and, as is my usual practice, I first read only the synopsis. This included the comment that the creep effects of load transfer from concrete to steel should be considered at the design stage. Being a design engineer, I concluded I ,must read the full paper. Having done so, I was not able to recognise any part of the contents that appeared to support this particular conclusion. There appeared to be no consideration of the effect on the ultimate capacity or serviceability of the column, which I understand to be the material criteria for design. There was a reference to the relationship between observed steel stresses and the CP 114 value of 'working stress', but I respectfully submit that the authors misunderstand this Code, as it is not actually based on working stresses but on factored ultimate stresses-a fundamentally different concept that makes the comparison meaningless.
Mr. M. G. Stevens: The layout and load capacity of a typical king pile is given in Fig 1.
We remarked in March that an arboriculturist friend considered that oak trees in this country were regenerating satisfactorily and their conservation was not at risk. That comment was engendered by a correspondent's concern over the felling of six oak trees; since then we have heard that some experts are seriously concerned about the possible invasion of oak wilt which is endemic in America and which can be carried in the American oak sapwood imported into this country for its highly decorative value. The
disease apparently spreads with great rapidity and, like Dutch elm disease, there is no treatment for it. The suggested precaution is to ban the importation of American oak wood.