AN ACT PROVIDING FOR THE FILING WITH THE DIVISION OF ARCHIVES, PATENTS, COPYRIGHTS, AND TRADE-MARKS OF THE EXECUTIVE BUREAU OF THE CONTRACTS OF MORTGAGE EXECUTED BY THE MANILA RAILROAD COMPANY AS SECURITY FOR THE ISSUANCE OF BONDS AND OTHER OBLIGATIONS, CREATING AND FIXING UPON THE PROPERTY COVERED BY SAID INSTRUMENTS A LIEN AT AND FROM THE TIME OF FILING THE SAME, AND EXEMPTING SAID INSTRUMENTS FROM THE PAYMENT OF STAMP TAXES, AND FOR OTHER PURPOSES.