An (n, r)-arc is a set of n points of a projective plane such that some r, but no r + 1 of them, are collinear. In this paper new (95, 7)-arc, (183, 12)-arc, (205, 13)-arc in PG(2,17) and (243, 14)-arc, (264, 15)-arc in PG(2,19) are constructed.

j. Stephen-Haynes,1,2 rGn, dn, diph, bsc (hons), anp, pG dipresearch, pGdip ed, professor in Tissue viability and consultant nurse; r. callaghan,2 rGn, bsc (hons), Tissue viability specialist nurse; a.wibaux,3 pharmd, principal scientist; P. johnson,3 md, vice president of research and development and medical and scientific affairs; n. carty,3 phd, research scientist and manager, medical and sc...

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We classify surfaces of general type S with pg = q = 1 having an involution i such that S/i is non-ruled and the bicanonical map of S factors through the natural cover S → S/i. We prove that the minimal model of S/i is either a K3 surface or a surface of Kodaira dimension 1 (in this last case S has a genus 2 fibration). We also show that these cases do occur. In particular we construct a surfac...