Each minister is responsible to the cabinet for the conduct of his department. He is constantly meeting with problems which may involve criticism in Parliament, and where a mistake might entail serious consequences for the whole government. In such cases he must decide how far he can assume to settle the question in accordance with his own opinion, and what matters he ought to bring before the cabinet. He must not, on the one hand, take up its time in discussing trivialities, and he must not, on the other, commit his colleagues to a course of action which really involves general policy. If in doubt he can, of course, consult the Prime Minister; but in spite of this privilege annoying blunders must inevitably occur. A minister naturally has charge in the cabinet of the business relating to his own department, but how far he takes an active part in other things will depend upon the interest that he feels in them. Lord Palmerston, for example, when Secretary for Foreign Affairs, took, as his letters show, little interest in anything else; but when he became Home Secretary he took not only an active but a leading part in directing the foreign relations of the country. This he was fully entitled to do, because the cabinet is both an assemblage of ministers at the head of the separate branches of the administration, and a council of state which must form a collective judgment upon the questions submitted to it. A minister is, therefore, justified in pressing his views on any subject, whether connected with his own department or not; and on no other basis could collective responsibility be maintained. The practice is particularly marked in the case of foreign affairs, which usually form a large part of the business at the meetings. [Sidenote: The Treasury and Other Departments.]