The jibe of social reformers like Ruskin against the economic man of the political economists has been losing its effectiveness these latter years, when it is being understood that the economic man was never intended to be more than an abstraction—like the pure solid or pure gas of the physicist. There has not been, however, any serious attempt to unravel the mental aspects of man as a workman either individually or in groups; either as employer or employed. Mr. Lewisohn must be commended for his brave attempt to prove that the relations of employer and employed do involve psychological problems; he essays to point out that psychological understanding—the principles of psycho-analysis—can be effectively used to