Sec. 3. PAYMENTS TO FUND. There shall be deducted for such fund from the wages of each fireman and policeman a sum to be determined by the board of trustees under the provisions of Sections 2, 10A, and 14A of this Act. Any donations made to such fund and rewards received by any member of either of said funds, and all funds received from any source for such fund shall be deposited in like manner to the credit of such fund.