''Rasa'' is the object of ''rasana'' (gustatory sense organ). Its material substances are ''apa'' and ''prithvi''. In manifestation and differentiation of ''rasa'', the other three ''akasha'' etc. (''akasha, vayu'' and ''tejas'') are causative factors. [64] | ''Rasa'' is the object of ''rasana'' (gustatory sense organ). Its material substances are ''apa'' and ''prithvi''. In manifestation and differentiation of ''rasa'', the other three ''akasha'' etc. (''akasha, vayu'' and ''tejas'') are causative factors. [64] |