Some writers seem to think that the difference between a crowd and a not-crowd is the difference between organized and unorganized, and the example is given of laborers unorganized as a crowd and of a trade-union as a not-crowd. But a trade-union can be and often is a crowd. We have distinguished between the crowd and the group; it is also necessary to distinguish between the crowd and the mob. Often the crowd or mass is confused with the mob. The examples given of the mass or crowd mind are usually a lynching-party, the panic-stricken audience in a theatre fire, the mobs of the French Revolution. But all these are very different from a mass of people merely acting under the same suggestion, so different that we need different names for them. We might for the moment call one a crowd and the other a mob. An unfortunate stigma has often attached itself to the crowd mind because of this tendency to think of the crowd mind as always exhibiting itself in inferior ways. Mass enthusiasm, it is true, may lead to riots, but also it may lead to heroic deeds. People talk much of the panic of a crowd, but every soldier knows that men are brave, too, in a mass. Students have often studied what they called the mass mind when it was under the stress of great nervous strain and at a high pitch of excitement, and then have said the mass acts thus and so. It has been thought legitimate to draw conclusions concerning the nature of the mass mind from an hysterical mob. It has been assumed that a crowd was necessarily, as a crowd, in a condition of hysteria. It has often been taken for granted that a crowd _is_ a pathological condition. And color has been given to this theory by the fact that we owe much of our knowledge of the laws of suggestion to pathologists. But the laws of the mass can be studied in ordinary collections of people who are not abnormally excited, who are not subjects for pathologists. The laws of the mass as of the mob are, it is true, the laws of suggestion and imitation, but the mob is such an extreme case of the mass that it is necessary to make some distinction between them. Emotion in the crowd as in the mob is intensified by the consciousness that others are sharing it, but the mob is this crowd emotion carried to an extreme. As normal suggestibility is the law of the mass, so abnormal suggestibility is the law of the mob. In abnormal suggestibility the controlling act of the will is absent, but in normal suggestibility you have the will in control and using its power of choice over the material offered by suggestion. Moreover, it must be remembered that emotional disturbance is not always the cause of the condition of suggestibility: the will may lose its ascendancy from other causes than excitement; suggestibility often comes from exhaustion or habit.