Note 251 — Chapter XII · THE JAIMINI-DARŚANA.
Edward B. (Edward Byles) Cowell translation
In the former case it would be a vidhi, in the latter a niyama. Cf. the lines vidhir atyantam aprápto niyamaḥ pákshike sati, tatra chányatra cha práptau parisaṃkhyá vidhíyate.