Section 2
SEC. 2. The sum hereby appropriated shall be disbursed by the Director of Agriculture, with the approval of the fui Secretary of Agriculture and Natural Resources, for the construction of modern laboratory building, the purchase of the necessary equipment, and the maintenance of said laboratory: Provided, That any balance of this appropriation remaining unexpended at the end of the fiscal year shall not revert to the Insular Treasury, but shall be used for the purposes for which it was appropriated, until exhausted.