In terms of Fielding's initial explanation of the novel, the middle third clearly acts, as most critics have noted, as a bridge between the Somerset and London scenes. The road section is loaded with comic incidents involving mistaken identity—scenes which, though not clearly related to one another, develop the novel's early concern for the perception of virtue and the relation between virtue and prudence. Indeed, they provide an expansion of this thematic material, for instead of the limited world of Somersetshire, Tom is perceived by and in turn perceives a number of quite different characters. As the scope of his perception and judgment widens, Tom's experience broadens and his character develops. Thus, in fact, the development of comparable events tends to move from Tom's Somersetshire experience towards anticipation of London. This arch-like structure itself focuses, as Digeon first noted, on the Inn at Upton as...