Author(s):
Frank J. Swetz (The Pennsylvania State University)
Benjamin Williamson (1827–1916) was an Irish mathematician who taught at Trinity College, Dublin. His Treatise on the Differential Calculus was very popular and went through many editions over the 40 years from its first appearance in 1872. Here is an image of the title page:

Williamson described his approach in the preface.


The first page of the text:

Exercises for students:

The copy owned by Oxford University has been digitized by GoogleBooks.
Index to Mathematical Treasures
Frank J. Swetz (The Pennsylvania State University), "Mathematical Treasure: Benjamin Williamson’s Elementary Treatise on Differential Calculus," Convergence (September 2023)