The question whether improvements have been made, the value thereof and the value of the land at the time of the entry of the grantee, shall be determined upon equitable principles by the court or a jury, at the election of the grantee.
RSA 535:15
RS 203:16. CS 216:16. GS 225:14. GL 244:14. PS 240:14. PL 351 :14. RL 407:14.