AMBULATOR: OR, A POCKET COMPANION IN A TOUR ROUND LONDON, Within the Circuit of Twenty-five Miles: DESCRIBING Whatever is Most Remarkable for Antiquity, Grandeur, Elegance, Or Rural Beauty: INCLUDING NEW CATALOGUES OF PICTURES; And Illustrated by HISTORICAL AND BIOGRAPHICAL OBSERVATIONS; To which are Prefixed, A Concise Description of the Metropolis, AND A MAP OF THE COUNTRY DESCRIBED.