1. Every regular application must be supported by proper certificates of good moral character, health, and physical and mental capacity for doing the public work, the certificates to be in such form and number as the regulations of the Commission shall provide; but no certificate will be received which is inconsistent with the tenth section of the civil-service act. 2. No one shall be entitled to be examined for admission to the classified postal service if under 16 or over 35 years of age, or to the classified customs service or to the classified departmental service if under 18 or over 45 years of age; but no one shall be examined for appointment to any place in the classified customs service, except that of clerk or messenger, who is under 21 years of age; but these limitations of age shall not apply to honorably discharged soldiers and sailors of the last war who are otherwise duly qualified. RULE XIII. 1. The date of the reception of all regular applications for the classified departmental service shall be entered of record by the Commission, and of all other regular applications by the proper examining boards of the district or office for which they are made; and applicants, when in excess of the number that can be examined at a single examination, shall be notified to appear in their order on the respective records. But any applicants in the several States and Territories for appointment in the classified departmental service may be notified to appear for examination at any place at which an examination is to be held, whether in any State or Territory or in Washington, which shall be deemed most convenient for them. 2. The Commission is authorized, in aid of the apportionment among the States and Territories, to hold examinations at places convenient for applicants from different States and Territories, or for those examination districts which it may designate and which the President shall approve. RULE XIV. Those examined shall be graded, and shall have their grade marked upon a register after those previously thereon, in the order of their excellence as shown by their examination papers, except that those from the same State or Territory may be entered upon the register together, in the order of relative excellence, to facilitate apportionment. Separate registers may be kept of those seeking to enter any part of the service in which special qualifications are required. RULE XV. The Commission may give a certificate to any person examined, stating the grade which such person attained and the proficiency in the several subjects, shown by the markings. RULE XVI.