Author(s):

Frank J. Swetz (The Pennsylvania State University)

Isaac Todhunter (1820-1884) was an English mathematician, an instructor of mathematics, and a prolific author of popular mathematics texts. Todhunter was at the forefront of Victorian mathematics reforms, particularly the teaching of geometry. His *The* *Elements of Euclid* appeared in 1862, attracting much attention. The images below are taken from a new edition published in 1872.

In the “Preface,” Todhunter explained his motives in writing the geometry book.

Basic definitions and concepts are first introduced.

In a similar manner, Todhunter began Book III with a set of definitions.

*The images above are supplied through the courtesy of the University of California Libraries. The work may be viewed in its entirety in the* *Internet Archive**.*

Index to Mathematical Treasures

Frank J. Swetz (The Pennsylvania State University), "Mathematical Treasure: Todhunter's Elements of Euclid," *Convergence* (August 2018)