behaviour and play of expression that they have capitulated before his exposition of the case.

Not infrequently it is a case of overcoming ingrained prejudices which are mostly unconscious and are supported by sentiment rather than reason. It is a thousand times more difficult to overcome this barrier of instinctive aversion, emotional hatred and preventive dissent than to correct opinions which are founded on defective or erroneous knowledge. False ideas and ignorance may be set aside by means of instruction, but emotional resistance never can. Nothing but an appeal to these hidden forces will be effective here. And that appeal can be made by scarcely any writer. Only the orator can hope to make it.