The series contains 6 of Gogerly's translations of different Jātaka stories. In Theravāda Buddhism, the jātakas (c. 4th century BCE) are a textual division of the Pāli Canon, included in the Khuḍḍaka Nikāya ('Minor Collection') of the Sutta Piṭaka - the second group of the Pāli collection of Buddhist writings. The term mainly refers to the stories of Gautama Buddha's previous lives, in both human and animal form. The Theravāda jātakas comprise about 547 poems, arranged roughly by increasing number of verses. They are written in a poetical form, the verses consisting of four to six lines, and are devided into chapters called nipātas.

The material mainly consists of handwritten translations of Buddhist texts by Gogerly and others, handwritten Pali-English dictionaries, and later correspondence concerning their publication.