enforcement by the Bureau of Customs or otherwise within its jurisdiction. S ECTION  1575 . Title of Chapter . — This chapter shall be known as the Internal Revenue Law. [2339-1.] S ECTION  1576 . Chief Officials of Bureau of Internal Revenue . — The Bureau of Internal Revenue shall have one chief and one assistant chief to be known respectively as the Collector of Internal Revenue and the Deputy Collector of Internal Revenue. [2339-2.] S ECTION  1577 . City Assessor and Collector of Manila . — The Collector of Internal Revenue shall be  ex officio  city assessor and collector of Manila and as such shall collect all its municipal revenues and shall perform in and for said city the duties impose d by this law on provincial treasurers generally. [2339-3.] S ECTION  1578 . Powers and Duties of Bureau . — The powers and duties of the Bureau of Internal Revenue shall comprehend the collection of all internal-revenue taxes, fees, and charges, and the enforcement according to law of all forfeitures, penalties, and f ines connected therewith. Said Bureau shall also give effect to and administer the supervisory and police powers conferred by this chapter or other law or parts of laws within its jurisdiction. aEcSIH [2339-4.] S ECTION  1579 . Specific Provisions to be Contained in Regulations . — The regulations of the Bureau of Internal Revenue shall, among other things, contain provisions specifying, prescribing, or defining: CHAPTER  39 Bureau of Internal Revenue PRELIMINARY  ARTICLE Title of Chapter Organization of Bureau ARTICLE  I 462 Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011