here is adistinction between hypotheses generated in that seclusion from observable fact which renders them fantasies, and hypotheses that are projections of the possi- bilities of facts already in existence and capable of report. There is adifference between the imaginative speculations that recognize no law except their own dialectic consistency, and those which rest on an observable movement of events, and which foresee these events carried to alimit by the force of their own movement. There is adifference between support by argument from arbitrarily assumed premises, and an argument which sets forth the implications of propositions resting upon facts already vitally significant.