SOURCE: A History of Greek Mathematics, Clarendon Press, 1921, 446 p.

In the following excerpt, Heath discusses the significance and content of several of Euclid's lesser-known works.

Gi; the Data =~ Sthe Data

…Most closely connected with the Elements as dealing with plane geometry, the subject-matter of Books I-VI, is the Data, which is accessible in the Heiberg-Menge edition of the Greek text, and also in the translation annexed by Simson to his edition of the Elements (although this translation is based on an inferior text). The book was regarded as important enough to be included in the Treasury of Analysis … as known to Pappus, and Pappus gives a description of it; the description shows that there were differences between Pappus's text and ours, for, though Propositions 1-62 correspond to the description, as also do Propositions 87-94 relating to circles at the end of the book, the intervening propositions do not...