In 1513 he began, at Wittenberg University, his Commentary on the Psalms, which has been known since 1876, and continued those lectures up to 1515 or 1516. Following his lively and practical bent, he refers therein to the most varied questions of theology and the religious life, and occasionally even introduces contemporary matters, so that these lectures afford many opportunities by which to judge of his development and mode of thought. First the scholia, which till then had been known only in part, were edited in a somewhat cumbersome form by Seidemann, then a better edition by Kawerau, containing both the scholia and the glosses, followed in 1885.[118] In dividing this exegetical work into scholia and glosses, Luther was following the traditional method of the Middle Ages. The glosses are very short, as was customary; they were written by Luther between the lines of the text itself or in the margin and explained the words and grammatical construction; on the sense they touch only in the most meagre fashion. On the other hand, the detailed scholia seek to unfold the meaning of the verses and often expand into free digressions. In addition to the glosses and the scholia on the Psalms, Kawerau’s edition also includes the preparatory notes, written by Luther in a copy of the first edition of the “_Psalterium quincuplex_” of Faber Stapulensis (Paris, 1509), which, like the glosses and scholia, attest both the learning of their author and the peculiar tendency of his mind. Luther used for his text the Latin Vulgate, making a very sparing use of his rudimentary Hebrew. The glosses and the scholia were, however, intended chiefly for the professor himself; to the students who attended his biblical lectures Luther was in the habit of giving a short dictation comprising a summary of what he had prepared, and then, with the assistance of his glosses and scholia, dilating more fully on the subject. Scholars’ notebooks containing such dictations given by Luther in early days together with his fuller explanation are in existence, but have never been printed.