if (Aleph.verbosity(Constants.LOQUACIOUS))
      System.out.print("Left ");
    t._left = buildTree(leftN, dir, peNo+numPE/2, numPE/2, minX, med, minY, maxY);
  } else {  // Remote PE
    try {
      gb.release();
    } catch (AlephException ale) {
      Aleph.warning("Release failed: " + ale.getMessage());
    }
    Builder builder = new Builder(gb, leftN, dir, peNo+numPE/2, numPE/2, 
          minX, med, minY, maxY);