Note E — First Book
Ernest Brehaut translation
P. 9, l. 2. Agripennis (arapennis, arpent), properly a measure of surface. Here it is used of length, just as American farmers use the term, acre, as a measure both of surface and of length, meaning in the latter case the side of a square acre—about 70 yards. That this is the usage here may be proved by a simple arithmetical operation.