SERIES EXPANSIONS FOR 2-DIMENSIONAL DIRECTED PERCOLATION

We have greatly extended the series expansions for moments of the pair connectedness and the percolation probability for directed bond and s ite percolation on the square and triangular lattices. In most cases w e have more than doubled the length of the previously known series. An alysis of the series generally seems to rule out ''simple'' rational v alues for the critical exponents. In all cases we find that the leadin g correction to scaling term is analytic.