Chapter 5, "The Old Academy", of Lloyd Gerson's From Plato to Platonism. This is the first chapter of part 2 (of 3) of the book. Part 2, "the continuing creation of Platonism", looks at the reception of Plato by following generations of Academic philosophers and thier influence on the developing tradition of "Platonism".

Chapter 5 "the Old Academy" looks at Speusippus and Xenocrates. It's sections are:

5.1 Speusippus and First Principles

5.2 Speusippean Knowledge

5.3 Xenocrates