LEUSDEN, JOHN, a celebrated philologist, born in 1624. He studied the learned languages and mathematics at Utrecht, and then went to Amsterdam to converse with the rabbis, and perfect himself in the Hebrew tongue; after which he became professor of Hebrew at Utrecht, where he acquired a great reputation, and died in the year 1699. He wrote many valuable works, the principal of which are, 1. Onomasticum Sacrum, 8vo; 2. Clavis Hebraica et Philologica Veteris Testamenti, 4to; 3. Novi Testamenti Clavis Græca, cum Annotationibus Philologicis, 8vo; 4. Compendium Biblicum Veteris Testamenti, 8vo; 5. Compendium Græcum Novi Testamenti, the best edition of which is that of London, in 1668, 12mo; 6. Philologus Hebræus, 4to; 7. Philologus Hebræo-mixtus, 4to; 8. Philologus Hebræo-Græcus, 4to; 9. Notes on Jonas, Joel, Hosea, and other books. He also gave correct editions of several learned works.