""A Primer of Real Functions"" is a mathematical textbook written by Ralph Philip Boas Jr. and published as part of the Carus Mathematical Monographs series. The book is aimed at students and mathematicians who are interested in studying real analysis and calculus. It covers a range of topics including limits, continuity, differentiability, integration, and sequences and series of functions. The book begins with an introduction to the real number system and the concept of limits, before moving on to topics such as continuity, differentiability, and integration. The author provides clear explanations of the concepts and theorems, and includes numerous examples and exercises to help readers understand and apply the material. The book is suitable for use as a textbook in undergraduate and graduate courses in real analysis and calculus, as well as for self-study by anyone interested in these topics.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations.