Issuance of certificates of registration.
Section 17
SEC. 17. Issuance of certificates of registration.—Every applicant who has satisfactorily passed the required examination, shall, upon payment of the registration fee, receive a certificate of registration as optometrist: Provided, That no such certificate shall be issued to any applicant who has not attained the age of twenty-one years. All certificates shall be signed by the members of the Board and attested by its secretary.