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912. Properly only a sub-form

The siṣ-aorist is properly only a sub-form of the iṣ-aorist, having the tense-sign and endings of the latter added to a form of root increased by an added s. It is of extreme rarity in the older language, being made in RV. only from the roots  sing and  go, and in AV. only from  leave, and doubtless also from pyā fill up and van win (see below, 914 b); the remaining older texts add jñā know (B.), jyā overpowerdhyā think (ÇB. once: the edition reads -dhā-), and ram be content (SV.: a bad variant for RY. rāsīya); other Brāhmaṇa forms which might be also of the s-aorist are adrāsīt, avāsīt, and ahvāsīt; and bhukciṣīya (PB. S.) must be regarded as an anomalous formation from √bhuj, unless we prefer to admit a secondary root bhukṣ, like bhakṣ from bhaj. In the later language have been found quotable from other roots only glāsīs, adhmāsīt, anaṁsīt, apāsīt, mlāsīs, andamnāsiṣus.

a. The participle hā́samāna and causative hāsayanti (RV.) show that hās had assumed, even at a very early period, the value of a secondary root beside  for other forms than the aorist.