Malcolm Sage, Detective by Herbert Jenkins

-"DISGUISE," Malcolm Sage had once remarked, "is the chief characteristic of the detective of fiction. In actual practice it is rarely possible. I am a case in point. No one but a builder, or an engineer, could disguise the shape of a head like mine"; as he spoke he had stroked the top of his head, which rose above his strongly-marked brows like a down-covered cone.

He maintained that a disguise can always be identified, although not necessarily penetrated. This in itself would be sufficient to defeat the end of the disguised man by rendering him an object of suspicion. Few men can disguise their walk or stance, no matter how clever they might be with false beards, grease-paint and wigs.