A Study in Latin Abstract Substantives by Manson A. Stewart explores the relationship between literary and popular vocabularies, primarily focusing on abstract substantives. The book investigates the prevalence of certain abstract noun classes in classical and plebeian Latin, arguing against the belief that abstract nouns are characteristic of common speech while classical language remains concrete. The study shows that classical prose is as abstract as popular speech and that no specific class of abstract nouns, including those in -tio, can be uniquely attributed to either. Stewart also discusses the historical linguistic changes, phonetic evidence, and influences on Latin from early writers to post-classical periods, considering word formation and its implications. The comprehensive analysis sheds light on the productive and non-productive suffixes and the characteristics of Latin vocabulary through different epochs. This scholarly work is essential for understanding the evolution and use of abstract substantives in Latin literature and speech.