Besides the provisions of rule 5 of article 62, any person who shall commit a felony after having been convicted by final judgment, before beginning to serve such sentence, or while serving the same, shall be punished by the maximum period of the penalty prescribed by law for the new felony.
Any convict of the class referred to in this article, who is not a habitual criminal, shall be pardoned at the age of seventy years if he shall have already served out his original sentence, or when he shall complete it after reaching said age, unless by reason of his conduct or other circumstances he shall not be worthy of such clemency.