The heirs in the descending line of a legatee or devisee, deceased before the testator, shall take the estate bequeathed or devised, in the same manner the legatee or devisee would have taken it if he had survived.
RSA 551:12
RS 156:11. CS 165:11. GS 174:12. GL 193:12. PS 186:12. PL 297 :12. RL 350:12.