Parr's writings fill several volumes, but all may be seen as beneath the reputation which he acquired through the variety of his knowledge and dogmatism of his conversation. The chief of them are his "Characters of Charles James Fox" (1809) and his edited reprint of "Tracts of Warburton and a Warburtonian", which caused controversy; in his critique of Warburton, he focused on the "worst" written by Warburton and Hurd, which probably did not deserve to be reprinted, even if they were deliberately being suppressed by their authors. His Latin preface to "The Three Treatises of Bellendenus" should also not be forgotten, regarded, as it was, as a great work of modern Latin.