On these two pages, Giacomo Leoni describes different types of walls. He writes about several materials which can be used to build a wall, including cement, stones and bricks. To make sure everyone understands his ideas, he adds drawings of the different walls onto the pages. Here Giacomo Leoni writes about forms of arches. He shows them in a floor plan and a cut. On the right page he starts the chapter about doors and windows.This is one of many pages, where Giacomo Leoni shows Details of a pillar. In this case it is an ionic pillar. He draws a view and a cut on one page and the other page is empty. Probably he wants to lead our focus on his beautiful drawing on the right side.
