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In the last paper published during his lifetime, CLEBSCHt enriched the analvtical geometry of the plane by the introduction of a new form, the connex, which includes as very special cases both the curve considered as point locus and the curve considered as line envelope. The connex (mn, n), of the m-th order and n-th class, is represented by an equation ( Xl ,X2, x3; n,l b U3)= 0, involving a set of point coordinates and a set of line co6rdinates. It may be defined as a manifold of c and with his pupil GODT, the case (1, n). The general connex (m, n) has been only incompletely investigated, principally in conniection with the theory of algebraic differential equations. ? An extension to space was first proposed by KRAUSE, 11 who took for element the combination of a poinlt and plane. An equation

On the point-line as element of space: a study of the corresponding bilinear connex