Preface

The variation in text sizes is as in the original.

The original book did not have numbered pages. Instead it labeled all recto (right-side) pages, grouped into six eight-page signatures. The signatures themselves have an unusual sequence: (pointing finger); * (asterisk); a; b; c; A. The verso (left-side) pages were unmarked; they are identified here as ||. The final page was an unnumbered foldout, about twice the size of a normal page.

Unless otherwise noted, spelling and punctuation are unchanged. A few specific notes are given at the end of the text, along with those passages of Euclid identified by number.