“ The common use of the word is for a favourite pursuit or occupation, with the idea either of excessive devotion or of absence of ulterior motive or of profit, &c., outside the occupation itself. This use is probably not derived from the easy ambling gait of the Irish “hobby,” but from the “hobby-horse,” the mock horse of the old morris-dances, made of a painted wooden horse’s head and tail, with a framework casing for an actor’s body, his legs being covered by a cloth made to represent the “housings” of the medieval tilting-horse. A hobby or hobby-horse is thus a toy, a diversion. ”