Sec. 3. TREASURER OF PENSION FUND. The city treasurer of any such city, or the person discharging the duties of the city treasurer, is hereby designated as the treasurer of the said pension fund for said city, and his official bond to said city shall operate to cover his position of treasurer of said pension fund. All moneys of every kind and character collected or to be collected for said fund, shall be paid over to said treasurer, and shall be administered and paid out only in accordance with the provisions of this Act.