"The constitution (art. 1, § 5) provides that ‘each house shall keep a journal of its proceedings;’ and that ‘the yeas and nays of the members of either house on any question shall, at the desire of one-fifth of those present, be entered on the journal.’ Assuming that by reason of this latter clause reference may be had to the journal, to see whether the yeas and nays were ordered, and, if so, what was the vote disclosed thereby . . . the journal may be appealed to on the question whether a law has been legally enacted . . . ."