SECTION 1. Article nineteen of section two of Act Numbered Two thousand and thirty-four is hereby amended to read as follows:
"ART. 19. The grantee shall begin the construction of the street railway herein provided for within one year from the date of the granting of the franchise, and the same shall be completed and in operation within three years after the expiration of said period of one year unless prevented by the act of God, or the public enemy, usurped or military power, martial law, riot, civil commotion or inevitable cause; otherwise the franchise herein granted shall become liable to forfeiture: Provided, That the Governor-General may at his option extend the period for the completion of the said street railway for a further period of not to exceed six months."