Analysis of extended series for bond percolation on the directed square lattice

Series expansions for the mean size and moments of the pair connectedness for bond percolation on the directed square lattice have been extended to order $p^{35}$. Standard Padé analysis of the mean-size series leads to the critical probability $p_c$=0.644 701±0.000 002. Allowance for corrections to scaling gives a leading correction exponent ${\Delta }_1$=1.000±0.012 and an increase of the error bar on $p_c$ to 0.000 012. The increased accuracy in the determination of $p_c$ allows a corresponding improvement in the estimates of the exponents γ, ${\nu }_{\perp }$, and ${\nu }_{?}$.