The application of this principle to Parliamentary government is very plain; it shows at once that the intrusion from without upon an office of an exterior head of the office, is not an evil, but that, on the contrary, it is essential to the perfection of that office. If it is left to itself, the office will become technical, self-absorbed, self-multiplying. It will be likely to overlook the end in the means; it will fail from narrowness of mind; it will be eager in seeming to do; it will be idle in real doing. An extrinsic chief is the fit corrector of such errors. He can say to the permanent chief, skilled in the forms and pompous with the memories of his office, "Will you, Sir, explain to me how this regulation conduces to the end in view? According to the natural view of things, the applicant should state the whole of his wishes to one clerk on one paper; you make him say it to five clerks on five papers." Or, again, "Does it not appear to you, Sir, that the reason of this formality is extinct? When we were building wood ships, it was quite right to have such precautions against fire; but now that we are building iron ships," etc., etc. If a junior clerk asked these questions, he would be "pooh-poohed!" It is only the head of an office that can get them answered. It is he, and he only, that brings the rubbish of office to the burning-glass of sense. The immense importance of such a fresh mind is greatest in a country where business changes most. A dead, inactive, agricultural country may be governed by an unalterable bureau for years and years, and no harm come of it. If a wise man arranged the bureau rightly in the beginning, it may run rightly a long time. But if the country be a progressive, eager, changing one, soon the bureau will either cramp improvement, or be destroyed itself. This conception of the use of a Parliamentary head shows how wrong is the obvious notion which regards him as the principal administrator of his office. The late Sir George Lewis used to be fond of explaining this subject. He had every means of knowing. He was bred in the permanent civil service. He was a very successful Chancellor of the Exchequer, a very successful Home Secretary, and he died Minister for War. He used to say, "It is not the business of a Cabinet Minister to work his department. His business is to see that it is properly worked. If he does much, he is probably doing harm. The permanent staff of the office can do what he chooses to do much better, or if they cannot, they ought to be removed. He is only a bird of passage, and cannot compete with those who are in the office all their lives round." Sir George Lewis was a perfect Parliamentary head of an office, so far as that head is to be a keen critic and rational corrector of it.