The commissioner reports annually to Congress. He has power to appoint such officers as Congress considers necessary. In 1868 a fine building for this department was completed at a cost of $140,000. It contains a chemical laboratory with all the necessary apparatus and materials, and a museum, or collection of specimens, of value in the study of agriculture, store-rooms for seeds to be sent throughout the country, &c. The beauty of the building and grounds adds a very attractive feature to the National Capital, and the Institution itself is a favorable comment on the wise and provident care bestowed by the government on the leading interest of the people. CHAPTER XXXIX. POST OFFICE DEPARTMENT AND POST MASTER GENERAL. This department of the government, whose head, the Post Master General, is a member of the Cabinet, exists by virtue of Section 8, Article 1st of the Constitution, where are these words: “Congress shall have the power to establish post offices and post roads.” From small beginnings, in early colonial times, and continued through the Revolutionary War, it has grown to be one of the largest and most important departments of the government. The security, speed, and cheapness of intercourse between all parts of the country and with foreign lands, is of the utmost importance to business and commerce; it encourages social intercourse and intimate relations among the people, and is of no small consequence in developing their intelligence and promoting their improvement. By successive laws of Congress it has been perfected to its present state of excellence. The duties connected with it are performed by many thousands of persons in every part of the country. They are of average intelligence and education, and must be trained to their work almost without personal instruction or supervision, yet so complete is the organization, and so pervading the influence of the central power, the regulations so simple, clear, and precise, that mistakes are extremely rare, considering the great number of transactions, and instances of misconduct in office are probably less frequent than in any other branch of the public service, though employing persons well trained and under close surveillance. The Post Master General is appointed by the President and the Senate for four years. His office is in the General Post Office at Washington. He has three assistants, appointed in the same manner as himself. He has a seal of his office, an impression from which must be affixed to the commission of every postmaster in the United States; and also to all copies of papers and documents that may be wanted from his office. This only can give them official value of the same importance as the original papers. He must give bonds as security for faithfulness in office, and take the usual official oath.