A STUDY of the subordinate clause in Avestan is important for the syntax of Indo-Germanic as well as of Indo-Iranian, since Avestan, Old Persian, Sanskrit, and Greek are the only dialects which have preserved the primitive distinction between the sub.junctive and the optative, the chief moods of the subordinate clause. In view of previous contributions' to this subject, I shall confine myself to temporal, causal, characteristic, and final clauses, and to the types which may be called indirect question and indirect discourse. In such clauses the indicative seems to denote reality, while the dependent moods, subjunctive, optative, and injunctive express more or less desirable contingencies. The same modal distinctions, I think, hold here which I have sought to show elsewhere in my studies on the syntax of the Avesta (Annals N. Y. Acad. Sciences, xii. 549-552, 562). 'lhe conjunctions which introduce subordinate clauses in Avestan are yat (GAv. hyat), yaO4, yad4l, yavat, yavata, ya&5it, and compound conjunctions one of whose parts is derived from the stem ya-. The cognates of Avestan yaare given by Hermann, Gab es im Indogermanisehen Ncbensdtze, lena Diss. = KZ. xxxiii. 481-535 [cited here as Diss.], 14, Pronomen *Los als Adjektivum, Coburger Programnm [cited here as Pr.], 15-16. The etymological equivalents of yavata, ya&5it, and vispam &a ahmnat yat are not found as conju1nctions in other Indo-Germanic dialects. The original meaning of yais somewhat doubtful. Hermann after an exhaustive discussion concludes that Taos was originally an anaphoric substantive, and that the relative pronoun Taos was derived from it (Pr., 16, 26). This does not seem to me as plausible as the older view that Laos was originally an anaphoric adjective which later developed a relative signification (Windiseb, Curt. Stud., ii. 201-419, Jolly, 72-73, 119-120, Spiegel, 525-527, Delbrftck, SF i. 30-32, 103, Hermann, Diss., 13-16, Streitberg,
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