5. The classified postal service shall embrace the several post-offices where the officials are as many as fifty, now the following: Albany, N.Y.; Baltimore, Md.; Boston, Mass.; Brooklyn, N.Y.; Buffalo, N.Y.; Chicago, Ill.; Cincinnati, Ohio; Cleveland, Ohio; Detroit, Mich.; Indianapolis, Ind.; Kansas City, Mo.; Louisville, Ky.; Milwaukee, Wis.; Newark, N.J.; New Orleans, La.; New York City, N.Y.; Philadelphia, Pa.; Pittsburg, Pa.; Providence, R.I.; Rochester, N.Y.; St. Louis, Mo.; San Francisco, Cal.; Washington, D.C. RULE VI. 1. There shall be open competitive examinations for testing the fitness of applicants for admission to the service. Such examinations shall be practical in their character and, so far as may be, shall relate to those matters which will fairly test the relative capacity and fitness of the persons examined to discharge the duties of the branch of the service which they seek to enter. 2. There shall also be competitive examinations of a suitable character to test the fitness of persons for promotion in the service. RULE VII. 1. The general examinations under the first clause of Rule VI for admission to the service shall be limited to the following subjects: (1) Orthography, penmanship, and copying; (2) arithmetic--fundamental rules, fractions, and percentage; (3) interest, discount, and elements of bookkeeping and of accounts; (4) elements of the English language, letter writing, and the proper construction of sentences; (5) elements of the geography, history, and government of the United States. 2. Proficiency in each of these subjects shall be credited in grading the standing of the persons examined in proportion to the value of a knowledge of such subjects in the branch or part of the service which the applicant seeks to enter. 3. No one shall be entitled to be certified for appointment whose standing upon a just grading in the general examination shall be less than 65 per cent of complete proficiency in the first three subjects mentioned in this rule, and that measure of proficiency shall be deemed adequate. 4. But for places in which a lower degree of education will suffice the Commission may limit the examinations to, first, penmanship, copying, and orthography; second, the fundamental rules of arithmetic; but no person shall be certified under this examination of a less grading than 65 per cent on each subject. 5. The Commission may also order examinations of a higher grade or upon additional or special subjects, to test the capacity and fitness which may be needed in any special place or branch of the service. RULE VIII.