19. As Jefferson developed the plan for the West Range and Gardens between the spring of 1818 and early July 1819, he updated the overall plan of the Lawn by cutting out the old version and substituting the new one. This diagram indicates how the plan evolved: A. West Road separtes the range from the pavilions, with the gardens behind the ranges (fig. 18): B. The gardens are now between the West Range and the pavilions (fig. 25): C. serpentine brick walls enclose the gardens (fig. 26).