converse proposition—that suggestibility is a derivative of the herd, instinct—would seem to me to throw far more light on the subject.
But Trotter's exposition, with even more justice than the others', is open to the objection that it takes too little account of the leader's part in a group, while we incline rather to the opposite judgement, that it is impossible to grasp the nature of a group if the leader is disregarded. The herd instinct leaves no room at all for the leader; he is merely thrown in along with the herd, almost by chance; it follows, too, that no path leads from this instinct to the need for a God; the herd is without a herdsman. But besides this Trotter's exposition can be under-mined psychologically; that is to say, it can be made at all events probable that the herd instinct is not irreducible, that it is not primary in the same sense as the instinct of self-preservation and the sexual instinct.
It is naturally no easy matter to trace the onto-genesis of the herd instinct. The dread which is shown by small children when they are left alone, and which Trotter claims as being already a manifestation of the instinct, nevertheless suggests more readily another interpretation. The dread relates to the child's mother, and later to other familiar persons, and it is the expression of an unfulfilled desire, which the child does not yet know how to deal with in any way