54 STAT.] 76TH CONG., 3D SESS.-CH. 421-JUNE 25, 1940 may pay rent, telephone, subscriptions to publications, and other charges incident to the conduct of their offices and the discharge of their duties, in advance, in any foreign country where custom or practice requires payment in advance: Provided further, That no part of the funds appropriated by this Act shall be used for the payment of any officer or employee of the Department of Agriculture who, as such officer or employee, or on behalf of the Department or any division, commission, or bureau thereof, issues, or causes to be issued, any prediction, oral or written, or forecast with respect to future prices of cotton or the trend of same: Provided further, That no part of the funds appropriated by this Act shall be used for laboratory investigations to determine the possibly harmful effects on human beings of spray insecticides on fruits and vegetables. MISCELLANEOUS EXPENSES, DEPARTMENT OF AGRICULTURE For stationery, supplies, materials, and equipment, freight, express, and drayage charges, advertising and press clippings, communica- tion service, postage, washing towels, repairs, and alterations; for the maintenance, repair, and operation of one motorcycle and not to exceed three motor-propelled passenger-carrying vehicles (includ- ing one for the Secretary of Agriculture, one for general utility needs of the entire Department, and one for the Forest Service) and purchase of one motor-propelled passenger-carrying vehicle at not to exceed $1,800, including the exchange value of one such vehicle, for official purposes only; for official travel expenses, including exam- ination of estimates for appropriations in the field for any bureau, office, or service of the Department; and for other miscellaneous supplies and expenses not otherwise provided for and necessary for the practical and efficient work of the Department, which are author- ized by such officer as the Secretary may designate, $105,000: Pro- vided, That this appropriation shall be available for the payment of salaries of employees engaged in the maintenance, repair, and operation of motor-transport vehicles, and that this appropriation shall be reimbursed from the appropriation made for any bureau or office for which such service is performed, in accordance with the provisions of the Act of May 11 1922 (5 U. S. C. 543): Provided further, That the Secretary of Agriculture, during the fiscal year for which this appropriation is made, may maintain stocks of sta- tionery, supplies, equipment, and miscellaneous materials sufficient to meet, in whole or in part, requirements of the bureaus and offices of the Department in the city of Washington and elsewhere, but not to exceed in the aggregate $200,000 in value at the close of the fiscal year, and the appropriations of such bureaus, offices, and agencies available for the purchase of stationery, supplies, equipment, and miscellaneous materials shall be available to reimburse the appro- priation for miscellaneous expenses current at the time supplies are allotted, assigned, or issued, or when payment is received; for transfer for the purchase of inventory; and for transfer pursuant to the provisions of section 601 of the Act approved June 30, 1932 (31 U. S. C. 686): Provided further, That the appropriations made here- under shall be available for the payment of salaries and expenses for purchasing, storing, handling, packing, or shipping supplies and blank forms, and there shall be charged proportionately as a part of the cost of supplies issued an amount to cover such salaries and expenses, and in the case of blank forms and supplies not purchased from this appropriation an amount to cover such salaries and expenses shall be charged proportionately to the proper appropria- 533 Employees predict- ing, etc., future prices of cotton. Laboratory investi- gations. Miscellaneous ex- penses. Provisos. Maintenance, etc. , of vehicles; reimburse- ment. 42 Stat. 508. Maintenance of sta- tionery, etc., stocks. Maximum value. Reimbursement. 47 Stat. 417 . 31 U. S. C., Supp. V, § 686. Purchasing, etc. , supplies.