PUBLIC LAWS-CH. 356 -JULY 30, 1947 44 Stat. 1422. 58 Stat. 742 . 60 Stat. 810. 5U.S.C. 655a. 37 Stat. 315. Post, p. 680. 42 Stat. 833 . 33 Stat. 1269; Stat. 40 . 58 Stat. 735. Post, p. 698. improving soils; fertilizers, fertilizer ingredients, and their improve- ment for agricultural use; soil management and crop production on dry and irrigated lands, and the quality of irrigation water and its use by crops; and for the classification of soils in a national system and indication of their extent and distribution on maps, and determi- nation of their potential productivity under adapted cropping and improved soil management; $1,466,000. Agricultural engineering: For investigations involving the appli- cation of engineering principles to agriculture, including farm power and equipment, rural water supply and sanitation, and rural electrifi- cation; farm buildings and their appurtenances and buildings for processing and storing farm products, and the preparation and dis- tribution of building plans and specifications; cotton ginning, and other engineering problems relating to the production, processing, transportation, and storage of agricultural products; $637,000. National Arboretum: For the maintenance and development of the National Arboretum established under the provisions of the Act approved March 4, 1927 (20 U. S. C. 191-194), including travel expenses of the advisory council, $436,900, of which not to exceed $350,000 shall be available for the acquisition of adjoining land, and not to exceed $2,500 may be expended for employment pursuant to the second sentence of section 706 (a) of the Organic Act of 1944 (5 U. S . C. 574) as amended by section 15 of the Act of August 2, 1946 (Public Law 600). Southern Great Plains Field Station: For replacement and repair of buildings, equipment and supplies, utilities, fences and other general repairs and clean-up operations from damages due to the recent tornado at Woodward, Oklahoma, $45,600. BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE SALARIES AND EXPENSES For expenses necessary for investigations, experiments, demon- strations, and surveys for the promotion of economic entomology, for investigating and ascertaining the best means of destroying insects and related pests injurious to agriculture, for importing useful and benuficial insects and bacterial, fungal, and other diseases of insects an(d related pests, for investigating and ascertaining the best means of destroying insects affecting man and animals, and the best ways of utilizing beneficial insects, for carrying into effect the provisions of the Plant Quarantine Act of August 20, 1912, as amended (7 U. S. C. 151-167), the Honey Bee Act (7U. S . C. 281-283), the Insect Pest Act (7 U. S. C. 141-144), the Mexican Border Act (7 U. S. C. 149) and the Organic Act of 1944 (7 U. S . C . 147a), authorizing the eradi- cation, control, and prevention of spread of injurious insects and plant pests; including the operation and maintenance of airplanes and the purchase of not to exceed seven, and not to exceed $745,350 for personal services in the District of Columbia, as follows: Insect investigations: For the investigation of insects affecting fruits, grapes, nuts, trees, shrubs, forests and forest products, truck and garden crops, cereal, forage and range crops, cotton, tobacco sugar plants, ornamental and other plants and agricultural products, household possessions, and man and animals; for bee culture and apiary management; for classifying, identifying, and collecting infor- mation to determine the distribution and abundance of insects; for investigations in connection with introduction of natural enemies of injurious insects and related pests and for the exchange with other countries of useful and beneficial insects and other arthropods; for 534 [61 STAT.