Title On a rank five geometry of Meixner for the Mathieu Group M(12) Author Dimitri Leemans Reference Geom. Dedicata 85(2001), nr. 1/3, 273-281. Math. Reviews 2002f:51021 Zentralblatt 0989.51007 Abstract We construct a rank five residually connected and firm geometry on which the Mathieu group M(12) acts flag-transitively and residually weakly primitively. The geometry has diagram c.c.c*.c* and orders 1,1,3,1,1. As a corollary, we get that the RWPRI+(IP)_2 rank of M(12) is five.