PUBLIC LAWS-CH. 279-JUNE 29, 1949 exchange, and storage of revolvers, uniforms, ammunition, and radio equipment and the rental of teletype service; and the purchase of passenger motor vehicles, bicycles, motorcycles, and self-propelled machinery; the hire of draft animals with or without drivers at local rates approved by the Secretary of the Interior; the purchase and maintenance of draft animals, harness, and wagons; $1,628,018: Pro- vided, That not to exceed $10,000 of the amount herein appropriated may be expended for the erection of minor auxiliary structures: Pro- vided further, That funds appropriated under or transferred to this head for services rendered by the National Park Service shall be expended by expenditure warrant as an advance to said service and shall be credited as a repayment and maintained in a special account. The amounts so advanced will be available for the objects specified herein or in the appropriation from which such funds are transferred, any unexpended balance to be returned to the appropriation concerned not later than two full fiscal years after the close of the current fiscal year. NATIONAL CAPITAL PARK AND PLANNING COMMISSION For necessary expenses of the National Capital Park and Planning 43 Stat. 463. Commission except the acquisition of land (40 U. S. C . 71), including stenographic reporting service as authorized by section 15 of the Act 60 Stat. 810 . of August 2, 1946 (5 U. S. C . 55a), and expenses of attendance at meetings of organizations concerned with city planning matters, $84,700: Provided,That funds appropriated under this head shall be expended by expenditure warrant as an advance to the National Capital Park and Planning Commission and shall be credited as a repayment and maintained in a special account. The amounts so advanced will be available for the objects herein specified, any unex- pended balance to be returned to this appropriation not later than two full fiscal years after the close of the current fiscal year. NATIONAL ZOOLOGICAL PARK For expenses necessary for the National Zoological Park, including erecting and repairing buildings; care and improvement of grounds; travel, including travel for the procurement of live specimens, pur- chase, care, and transportation of specimens; purchase of motorcycles; revolvers and ammunition; purchase of uniforms and equipment for police, and uniforms for keepers and assistant keepers; $544,700: Provided That funds appropriated under this head shall be expended by exenditure warrant as an advance to the National Zoological Park and shall be credited as a repayment and maintained in a special account. The amounts so advanced will be available for the objects herein specified, any unexpended balance to be returned to this appro- priation not later than two full fiscal years after the close of the current fiscal year. GENERAL PROVISIONS Vouchers SEC. 2 . Except as otherwise provided herein, all vouchers covering expenditures of appropriations contained in this Act shall be audited before payment by or under the jurisdiction only of the Auditor for the District of Columbia and the vouchers as approved shall be paid by checks issued by the Disbursing Officer without countersignature. CimenHPt.r SEC. 3. No part of any appropriation contained in this Act or authorized hereby to be expended shall be used to pay the compensa- tion of any officer or employee of the Government of the United States, 322 [63 STAT.
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