Mark, I'm going to second this request, especially since you've made the QuadTree private (in r846). I was relying on directly modifying the QuadTree when I needed to remove an object from a GeomVectorField, since no remove method was provided. I now have a temporary workaround by having an "unauthorized trunk" of GeoMASON where I've made the QuadTree public again (I suppose I could also have just added my own remove method, but wanted to keep the change typographically light). But I'd be much happier to use an approved remove method. Thanks! Matt L. Miller UCDavis