(4) And it is imagined by many that the operations of the common mind can be by no means compared with these processes , and that they have to be acquired by a sort of special training . To hear all these large words , you would think that the mind of a man of science must be constituted differently from that of his fellow men; but if you will not be frightened by terms , you will discover that you are quite wrong , and that all these terrible apparatus are being used by yourselves every day and every hour of your lives.