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874. The sibilant tense-stem

III. Sigmatic or Sibilant Aorist.

a. The common tense-sign of all the varieties of this aorist is a स् s (convertible to ष् : 180) which is added to the root in forming the tense-stem.

b. This sibilant has no analogues among the class-signs of the present-system; but it is to be compared with that which appears (and likewise with or without the same union-vowel i) in the stems of the future tense-system (932 ff.) and of the desiderative conjugation (1027 ff.).

c. To the root thus increased the augment is prefixed and the secondary endings are added.