184. The nasalization of the alterant vowel

The nasalization of the alterant vowel—or, in other words, its being followed by anusvāra—does not prevent its altering effect upon the sibilant: thus, havīṅṣi, parūṅṣi. And the alteration takes place in the initial s of an ending after the final s of a stem, whether the latter be regarded as also changed to ṣ or as converted into visarga: thus, haviṣṣu or haviḥṣu, paruṣṣu or paruḥṣu.

a. But the s of puṁs (394) remains unchanged, apparently on account of the retained sense of its value as pums; also that of √hiṅs, because of its value as hins (hinasti etc.); √niṅs (RV. only) is more questionable.