Onderzoek en phantasie.Leiden, C.C.van der Hoek,1838. 1st edition, 12mo. xviii,335pp. original paper binding, spine restored, donated by the author to Ph. W. van Heusde. Library stamps of Gymnasium Haarlem, some age staining, otherwise good copy. Philip Willem van Heusde (June 17, 1778 in Rotterdam - July 2, 1839 in Geneva) was a Dutch philosopher and educator. He is known for his influence on the founders of the so-called Groningen school of theology. He studied literature and law in Amsterdam and Leiden. In 1803 he received his doctorate in literature with a dissertation on Plato. During the same year, he obtained his law degree. From 1803 to 1815, he was a professor of history, antiquities, eloquence and Greek studies at Utrecht University, where from 1815 to 1839, he was a professor of theoretical philosophy and literature. At Utrecht, he also served as university librarian (1816-1839). He died on July 2nd, 1839 in Geneva, while traveling to Rome. Jacob Geel (12 November 1789 - 11 November 1862) was a Dutch scholar, critic and librarian. He was born in Amsterdam. In 1823 he was appointed as a librarian, and in 1833 as university librarian and honorary professor at Leiden University, where he remained until his death. Geel materially contributed to the development of classical studies in the Netherlands. He was the author of editions of Theocritus (1820), of the Vatican fragments of Polybius (1829), of the Olympikos of Dio Chrysostom (1840) and of numerous essays in the Rheinisches Museum and Bibliotheca critica nova, of which he was one of the founders. He also compiled a valuable catalogue of the manuscripts in Leiden University Library, wrote a history of the Greek sophists, and translated various German works into Dutch.