Acknowledgments • The photograph of Henry Jack is courtesy of the University of Dundee Archive Services. [Please note that the photograph of Henry Jack being reproduced in this volume is the only known photo to exist of Henry Jack.] • The photograph of Philip Hall is courtesy of the Royal Society, © The Royal Society. • The photograph of Dudley Ernest Littlewood is courtesy of Baxter's Pho- tography, Llandudno. • The photograph of Ian Macdonald is courtesy of Sara Wilkinson. • "The algebra of partitions," I. G. Macdonald, Group Theory: Essays for Philip Hall, K. W., Gruenberg and J. E. Roseblade, Editors, Academic Press, London, 1984. © 1984 by the London Mathematical Society. • "On certain symmetric funcitons," D. E. Littlewood, Proc. London Math. Soc. (3) 11 (1961), pp. 485-498. @1961 by the London Mathematical Society. • "A class of symmetric polynomials with a parameter," Henry Jack, Pro- ceedings of the Royal Society of Edinburgh, Section A (Mathematical & Physical Sciences), volume 69 (1970/71), pp. 1-18. Reproduced by per- mission of the Royal Society of Edinburgh from Proceedings of the Royal Society of Edinburgh, Section A (Mathematical & Physical Sciences), vol- ume 69 (1970/71). • First letter from Henry Jack to G. de B. Robinson [16.4.76] Note added by Prof. W.N. Everitt, Department of Mathematics, University of Dundee on 5 Sept. 1980 Second letter from Henry Jack to G. de B. Robinson [4 May 76] Reply from G. de B. Robinson to the two letters by Henry Jack [June 28, 1976] Letter from Professor W.N. Everitt to G. de B. Robinson [14 October 1980]. • The photograph ofVadim Kuznetsov is courtesy of the University of Leeds and Brian Sleeman. xix

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