All this curious and indispensable mechanism of party government is compatible with a high and genuine sense of public duty, and unless such a sense at the last resort dominates over all other considerations, political life will inevitably decline. At the same time it is obvious that many things have to be done from which a very rigid and austere nature would recoil. To support a Government when he believes it to be wrong, or to oppose a measure which he believes to be right; to connive at evasions which are mere pretexts, and at delays which rest upon grounds that are not openly avowed,--is sometimes, and indeed not unfrequently, a parliamentary duty. A member of Parliament must often feel himself in the position of a private in an army, or a player in a game, or an advocate in a law case. On many questions each party represents and defends the special interests of some particular classes in the country. When there are two plausible alternative courses to be pursued which divide public opinion, the Opposition is almost bound by its position to enforce the merits of the course opposed to that adopted by the Government. In theory nothing could seem more absurd than a system of government in which, as it has been said, the ablest men in Parliament are divided into two classes, one side being charged with the duty of carrying on the government and the other with that of obstructing and opposing them in their task, and in which, on a vast multitude of unconnected questions, these two great bodies of very competent men, with the same facts and arguments before them, habitually go into opposite lobbies. In practice, however, parliamentary government by great parties, in countries where it is fully understood and practised, is found to be admirably efficacious in representing every variety of political opinion; in securing a constant supervision and criticism of men and measures; and in forming a safety valve through which the dangerous humours of society can expand without evil to the community.