The fect that the verbs m the Teutonic languages are divided into two classes according to the different formations of their preterits, gives the inquiry into the origin of the preterit of the so-called weak verb a peculiar interest to the student of Teutonic philology. The regular development of the strong preterit from the perfect active of the Aryan parent-speech has long been recognized, but the origin of the weak preterit is still an open question. Formerly the weak preterit was considered to be formed by the addition to the verbal stem of the Aryan root dhē (or as it was formerly put, dhā) “do.” Since the publication by Wilhelm Begemann of his two monographs ‘ Das schwache Präteritum der germaniscben Sprachen’ (Berlin 1873) and ‘ Zur Bedeutting des schwachen Preteritums der germanischen Sprachen’ (ib. 1874), this composition-theory has gradually been abandoned, for Begemann showed that such formations as mah-ta, kun-pa, wis-sa, etc. on the one hand, and nasi-da, habaida, fullnōda, on the other, did not, as the early theory assumed, originally contain a dh in their suffixes, but rather a t in accordance with the similar formation of their participles. (e. g. Goth. mah-t-s and mah-ta). However, his thesis, though supported with acumen and scholarship, was at first rejected by all who passed judgment upon it But it has come to honor since the partial adhesion of Windisch and the full adhesion of Möller, the former m Kuhn‘s Beiträge zur vergleichenden Sprachforschung, VIII (1876), p. 456f., and the latter in Kölbing‘s Englische Studien, III (1880), p. 160f. But the recognition of the fect that the characteristic of the weak preterit was originally a dental tenuis does not constitute a solution of the problem, but only the beginning of a solution. It still remains to inquire further into the source of this tense characteristic and to explain the striking similarity in the formation of the weak preterit and the weak participle.