The diminution or abolition of the sense of personal responsibility, which results from membership in a crowd and which, as we have seen, favours the display of its emotions, tends also to lower the level of its intellectual processes. Wherever men have to come to a collective decision or to undertake collective action of any sort, this effect plays an important part. The weight of responsibility that would be felt by any one man, deciding or acting alone, is apt to be divided among all the members of the group; so that for each man it is diminished in proportion to the number of persons taking part in the affair. Hence the attention and care devoted by each man to the task of deliberation, observation, or execution, are less keen and continuously sustained, and a judgment or decision is more lightly and easily arrived at, grounds which the individual, deliberating alone, would reject or weigh again and again serving to determine an immediate judgment. The principle is well recognised in practical life. We do not set ten men to keep the look-out on ship-board, but only one; though the safety of the ship and of all that it carries depends upon his unremitting alertness. We see the principle recognised in the institution of the jury. But for the weakening of the individual sense of responsibility, juries would seldom be found capable of finding a prisoner guilty of murder and so condemning him to death; while, by the restriction of the jury to a comparatively small number, the worst features of collective mental life are avoided. We see the working of the principle not only in simple crowds, but also in groups of very considerable degrees of organisation. We see it in the way in which many a man, who would shrink from the responsibility of directing a great and complicated commercial undertaking, will cheerfully join a board of directors each of whom is perhaps no better qualified than himself to conduct the business of the concern. We may recognise its effects also in the cheerful levity, not to say hilarity, that frequently pervades our House of Commons; for most of its well-meaning members would be utterly crushed under the weight of their legislative responsibility, were it not divided in small fractions among them.