The selectmen shall make such deductions from the appraised value of the property of insane persons as they shall think just and reasonable, whenever it shall appear that the income of their estates is not sufficient to support them.
RSA 75:6
RS 42:4. CS 44:5. GS 52:5. GL 56:5. PS 58:5. PL 63 :5. RL 76:6.