This is actually three works, the first, with a title page set in red and black in red and black, states that it is Philologus Hebræus continens quæstiones Hebraicas, quæ circa Vetus Testamentum Hebræum fere moveri solent. The facing page has a full copper plate portrait of Leusden. The text, in Latin with occasional Hebrew, consists of theory-seven discourses.

The second part with its own title page, set entirely in black ink, is Philogus Hebraeo Mixtus. It is comprised of fifty discourses and accomopanied by copper plate illustrations. In his discussion of the Talmud Leusden questions whether the Talmud is a divine revelation and an appropriate foundation for theology. Concerning the first Temple he writes that at the time of the Prophets there were no sectarian disputes, groups such as the Rechabites being notable for their way of life rather than their ideology. Philologus hebraeo-mixtus is notable for the copper plate illustrations depicting the practices described in the book. Within the text are numerous leaves of illustrations. They are of seventeen types of attire worn by the priests in the Temple; of the Tabernacle with varied activity within its walls and wagons surrounding it representing the gifts brought by the princes of the tribes of Israel at the time of its dedication; the vessels used in the Tabernacle and Temple; four pages each with four vignettes of scenes of Jewish life, depicting tefilin (phylacteries), a Jew holding Megillat Esther, blowing the shofar, and wearing tefilin; sitting in a Sukkah, hair cutting, distributing alms, and blessing the new moon; and lighting a candelabra, Purim festivities, Tisha b’Av, and flagellation. Yet another page, this with three vignettres, the top across the length of the page described as Poculum Zelotyiae (a drinking bout), a funeral, and a circumsion. In addition to these illustrations there are numerous head-pieces and tail-pieces and historiated letters at the beginning of all major sections. The illustrations were so well done and popular that the Jewish Encyclopedia used these vignettes as illustrations of scenes of Jewish life. The third part, also with its own title page, is Philogus Hebraeo-Graecus.