We shall arrive at the same sort of mixed conclusion if we examine the choice of a Premier under both systems in the critical case of Cabinet government⁠—the case of three parties. This is the case in which that species of government is most sure to exhibit its defects, and least likely to exhibit its merits. The defining characteristic of that government is the choice of the executive ruler by the legislative assembly; but when there are three parties a satisfactory choice is impossible. A really good selection is a selection by a large majority which trusts those it chooses, but when there are three parties there is no such trust. The numerically weakest has the casting vote⁠—it can determine which candidate shall be chosen. But it does so under a penalty. It forfeits the right of voting for its own candidate. It settles which of other people’s favourites shall be chosen, on condition of abandoning its own favourite. A choice based on such self-denial can never be a firm choice⁠—it is a choice at any moment liable to be revoked. The events of 1858