A discussion of Bolanci (also Bole or Bolewa), a West Chadic language spoken in northeastern Nigeria, focuses on one component of the system of complementation, the form "na." This form has an inherent semantic capable of influencing the meaning of sentences in which it is embedded, specifically, when present in a complex sentence, communicating evidential meanings distinct from those communicated by analogous sentences without the form. "Na" is examined in combination with cognitive-utterance verbs and perception verbs and in direct versus indirect speech. It is concluded that "na" introduces propositional content that is not directly witnessed and cannot be directly validated by the speaker and cannot be seen as a functor devoid of semantic content. (MSE)