For Aristotle, arousing the passions of others can amount to giving them proper grounds for conviction. On that basis a skill in doing so can be something valuable, an appropriate constituent of the kind of expertise in rhetoric that deserves to be cultivated and given expression in awell-organised state. Such are Jamie Dow's principal claims in Passions and Persuasion in Aristotle's Rhetoric. He attributes to Aristotle a normative view of rhetoric and its role in the state, and ascribes to him a particular view of the kinds of cognitions involved in the passions. In the first sustained treatment of these issues, and the first major monograph on Aristotle's Rhetoric in twenty years, Dow argues that Aristotle held distinctive and philosophically interesting views of both rhetoric and the nature of the passions. In Aristotle's view, he argues, rhetoric isexercised solely in the provision of proper grounds for conviction (pisteis). This is rhetoric's valuable contribution to the proper functioning of the state. Dow explores, through careful examination of the text of the Rhetoric, what normative standards must be met for something to qualify inAristotle's view as 'proper grounds for conviction', and how he supposed these standards could be met by each of his trio of "technical proofs" (entechnoi pisteis) - those using reason, character and emotion. In the case of the passions, Dow suggests, meeting these standards is a matter of arousing passions that constitute the reasonable acceptance of premises in arguments supporting the speaker's conclusion. Dow then seeks to show that Aristotle's view of the passions is compatible with this role inrhetorical expertise. This involves taking a stand on a number of controversial issues in Aristotle studies. In Passions and Persuasion, Dow rejects the view that Aristotle's Rhetoric expresses inconsistent views on emotion-arousal. Aristotle's treatment of the passions in the Rhetoric is, heargues, best understood as expressing a substantive theory of the passions as pleasures and pains. This is supported by a new representationalist reading of Aristotle's account of pleasure (and pain) in Rhetoric 1. Dow also defends a distinctive understanding of how Aristotle understood the contribution of phantasia ("appearance") to the cognitive component of the passions. On this interpretation, Aristotelian passions must involve the subject's affirming things to be the way that they are represented. Thusunderstood, the passions of an emotionally-engaged audience can constitute a part of their reasonable acceptance of a speaker's argument.