shall have no such infraction or violation of the said rules recorded
against him or her during any month of the first year of his or her
imprisonment, shall be entitled to a deduction from the term of his or
her sentence of one day for the first month, of two additional days
for the second month, and of three additional days for the third and
each of the remaining months of the said first year of imprisonment,
and shall also be entitled for continued good conduct during the
second year, to a similar deduction of four days for each month during
which he or she shall not have violated the rules aforesaid, and to a
deduction of one additional day per month for each succeeding year
until the expiration of the tenth year, and to an additional deduction
of two days per month during each year of the remainder thereof:
_Provided_, That it shall be lawful for the inspectors of said
penitentiaries or prisons, if any such convicts or persons shall
wilfully infringe or violate any of said rules or regulations, or
offend in any other way, to strike off the whole or any part of the
deduction which may have been obtained previous to the date of such
offence.