One often remembers these while forgetting many vital constructive features.

What is peculiar in the constructive features of Roman masonry?

As indicated above, these are, first, essential or actual constructive features and, second, extra or superconstructive features.

The earliest part of Suger's building is in the Romanesque style; it still retains the round Roman arch and many other Roman constructive features.

10), and other constructive features may also be applied in a similar way, or may be provided for during the casting of the slab.