There is another circumstance, with respect to lines, deserving attention. The course of a river may frequently shew two or more different bends, which do not so intersect each other as to impede the view along it; and these may be increased in proportion to the breadth of the river: but in a road, or a walk, especially if it passes through a wood or plantation, a second bend should never be visible. The degree of curve in a walk, or road, will therefore depend on its width; thus looking along the narrow line of walk, you will not see the second bend: but in the same curve, if the road be broader, we should naturally wish to make the curve bolder by breaking from it, according to the dotted line from A to B in the diagram [fig. 73].
