First published in 1926, this book contains the first volume of a three-volume English translation of the thirteen books of Euclid's Elements.

Introduction: 1. Euclid and the traditions about him; 2. Euclid's other works; 3. Greek commentators other than Proclus; 4. Proclus and his sources; 5. The text; 6. The scholia; 7. Euclid in Arabia; 8. Principal translations and editions; 9. On the nature of elements; The Elements: Book I: Definitions, postulates, common notions; Notes on definitions etc.; Propositions; Book II: Definitions; Note on geometrical algebra; Propositions; Excursus I. Pythagoras and the Pythagoreans; Excursus II. Popular names for Euclidean propositions; Greek index to vol. 1; English index to vol. 1.