"Sec. 24. The practice of civil engineering is a professional service, admission to which must be determined upon individual, personal qualifications. Hence, no firm, partnership, corporation or association may be registered or licensed as such for the practice of civil engineering: Provided, however, That persons properly registered and licensed as civil engineers may, among themselves or with a person or persons properly registered and licensed as architects, form, and obtain registration of, a firm, partnership or association using the term "Engineers" or "Engineers and Architects," but, nobody shall be a member or partner of such firm, partnership or association unless he is a duly licensed civil engineer or architect, and the members who are civil engineers shall only render work and services proper for a civil engineer, as defined in this Act, and the members who are architects shall also only render work and services proper for an architect, as defined in the law regulating the practice of architecture; individual members of such firms, partnership or association shall be responsible for their own respective acts.