Trimmer's later works, such as her emphasis on retaining social hierarchies; as Tess Cosslett, a scholar of children's literature explains, "the notion of hierarchy that underpins Fabulous Histories is relatively stable and fixed. Parents are above children in terms of authority, and humans above animals, in terms both of dominion and compassion: poor people should be fed before hungry animals… [but] the hierarchical relation of men and women is not so clearly enforced." Moira Ferguson, a scholar of the 18th and 19th centuries, places these themes in a larger historical context, arguing that "the fears of the author and her class about an industrial revolution in ascendance and its repercussions are evident. Hence, [the] text attacks cruelty to birds and animals while affirming British aggression abroad. …The text subtly opts for conservative solutions: maintenance of order and established values, resignation and compliance from the poor at home, expatriation for foreigners who do not assimilate easily." A second overarching theme in the text is rationality; Trimmer expresses the common fear of the power of fiction in her preface, explaining to her childish readers that her fable is not real and that animals cannot really speak. Like many social critics during the 18th century, Trimmer was concerned about fiction's potentially damaging impact on young readers. With the rise of the novel and its concomitant private reading, there was a great fear that young people and especially women would read racy and adventurous stories without the knowledge of their parents and, perhaps even more worrisome, interpret the books as they pleased. Trimmer therefore always referred to her text as Fabulous Histories and never as The Story of the Robins in order to emphasize its reality; moreover, she did not allow the book to be illustrated within her lifetime—pictures of talking birds would only have reinforced the paradox of the book (it was fiction parading as a history). Yarde has also speculated that most of the characters in the text are drawn from Trimmer's own acquaintances and family. The Guardian of Education Later in her life, Trimmer published the influential Guardian of Education (June 1802 – September 1806), which included ideas for instructing children and reviews of contemporary children's books. Although one previous attempt had been made to regularly review children's books in Britain, according to Matthew Grenby, "it was a far less substantial and sustained enterprise than Trimmer's". The Guardian included not only