The variation in text sizes is as in the original.
In the printed book, all sidenotes were shown in the outer margin. For this e-text, they have been divided. Text sidenotes—including single numerals—are in the right margin; symbols are on the left, along with page numbers. The continuous quotation marks could not be reproduced, so they are shown as oversized open quotes “ and close quotes ” in the left margin.
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.
