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These volumes were published to honour a great scientist—who needs no introduction to readers of this journal—on his seventieth birthday. They contain his written contributions to the knowledge of a variety of engineering subjects over the fifty years from 1902–1952. His work is characterized not only by a depth of penetration but also an extraordinary width of vision, and perhaps there is no better way of displaying this fact than briefly to describe the papers each in turn. As there are over one hundred, this is no mean task that your reviewers have assailed. But we found it, at least for ourselves, a rewarding one. The insight into, and perhaps even understanding of, a great mind at work can perhaps be conveyed no other way. The familiarity and freshness, too, of even many of the early papers left us feeling rather like the lady who remarked, on hearing one of Shakespeare's plays, that she found it so entertaining because the author used so many quotations.