Even in the case of naval officers entering administrative offices, the influence of prolonged tenure is in the same direction. The habits of a previous lifetime doubtless act as a check, in proportion to the strength they have acquired in the individual. They serve as an invaluable leaven, not only to his own thought but to that of his associates. Nevertheless, the experience is general that permanence in an office essentially civil tends to deaden the intimate appreciation of naval exigencies; yet upon this alone can thrive that sympathy between the administrative and executive functions of the navy which is requisite to efficiency. The habit of the arm-chair easily prevails over that of the quarterdeck; it is more comfortable. For this reason, in the best-considered systems, a frequent exchange between the civil and military parts of their profession, between the administrative offices and the army or fleet, is thought expedient for officers who show aptitude for the former. It is better for them personally, better for the administration, and consequently better for the service at large. It prevails extensively in the United States Navy, where it is frequently the subject of ill-instructed outside criticism on the score of sea-officers being on “shore duty.” Without asserting that the exact proportions of service are always accurately observed, it may be confidently affirmed that the interchange between the civil and military occupations tends to facilitate the smooth working of both, by promoting mutual understanding of conditions and difficulties. _The British System_[35] [From 1660 to 1832, British naval administration was divided between a civilian “Navy Board” and a military “Board of Admiralty.”—EDITOR.]