extension work; ( g ) By the collection of agricultural statistics; and ( h ) By the publication and distribution of bulletins, circulars, and other printed matter. SECTION  1851 . Experiment Stations, Farms, and Stations for Agricultural Instruction . — In such places in the Philippine Islands as may be considered suitable for the purpose, the Director of Agriculture shall, as funds shall be available therefor, establis h, equip, maintain, and operate experiment stations, farms, stock farms, and stations for practical agricultural instruction. [2226-1.] In the Bureau of Agriculture is also vested the supervision and control of American agricultural colonies. [Ex. Or. 59 (1914).] SECTION  1852 . Stations Operated Jointly by Bureau of Agriculture and Other Body . — Where circumstances are deemed favorable, stations for practical agricultural instruction may be established and operated by the Bureau of Agriculture in cooperation with an y province, municipality or agricultural association of the Philippine Islands; but such stations shall, in all cases, be managed under the supervision and control of the Director of Agriculture. [2226-2.] SECTION  1853 . Control Over Exportation and Importation of Plant Material.  — The exportation from and the importation into the Philippine Islands of all plant material or parts thereof or of any material whatsoever which may be used for packing material or  covering thereof is prohibited except through such ports as may be designated by and subject to such rules and regulations as may from time to time be prescribed by the Director of Agriculture and approved by the Secretary of Public Instruction. [2515-1.] SECTION  1854 . Protection of Agricultural Interests from Plant Diseases . — The Director of Agriculture shall, subject to the approval of the Secretary of Public Instruction, make and enforce such rules and regulations as he may deem necessary to protect the  agricultural interests in any district infested or infected with any injurious or dangerous plant pest or disease which may have become Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 550