It should be noticed, however, that verifiable truths may acquire the potency of herd suggestion, so that the suggestibility of man does not necessarily or always act against the advancement of knowledge. For example, to the student of biology the principles of Darwinism may acquire the force of herd suggestion through being held by the class which he most respects, is most in contact with and the class which has therefore acquired suggestionizing power with him. Propositions consistent with these principles will now necessarily be more acceptable to him, whatever the evidence by which they are supported, than they would be to one who had not been exposed to the same influences. The opinion, in fact, may be hazarded that the acceptance of any proposition is invariably the resultant of suggestive influences, whether the {40} proposition be true or false, and that the balance of suggestion is usually on the side of the false, because, education being what it is, the scientific method—the method, that is to say, of experience—has so little chance of acquiring suggestionizing force. Thus far sensitiveness to the herd has been discussed in relation to its effect upon intellectual processes. Equally important effects are traceable in feeling. It is obvious that when free communication is possible by speech, the expressed approval or disapproval of the herd will acquire the qualities of identity or dissociation from the herd respectively. To know that he is doing what would arouse the disapproval of the herd will bring to the individual the same profound sense of discomfort which would accompany actual physical separation, while to know that he is doing what the herd would approve will give him the sense of rightness, of gusto, and of stimulus which would accompany physical presence in the herd and response to its mandates. In both cases it is clear that no actual expression by the herd is necessary to arouse the appropriate feelings, which would come from within and have, in fact, the qualities which are recognized in the dictates of conscience. Conscience, then, and the feelings of guilt and of duty are the peculiar possessions of the gregarious animal. A dog and a cat caught in the commission of an offence will both recognize that punishment is coming; but the dog, moreover, knows that he has done _wrong_, and he will come to be punished, unwillingly it is true, and as if dragged along by some power outside him, while the cat’s sole impulse is to escape. The rational recognition of the sequence of act and punishment is equally clear to the gregarious and to the solitary animal, but it is the former only who understands {41} that he has committed a _crime_, who has, in fact, the _sense of sin_. That this is the origin of what we call conscience is confirmed by the characteristics of the latter which are accessible to observation. Any detailed examination of the phenomena of conscience would lead too far to be admissible here.