"A System of Logic, Ratiocinative and Inductive (Vol. 1 of 2)" by John Stuart Mill is a philosophical work published in 1843. This foundational text formulates Mill's five principles of inductive reasoning, known as Mill's Methods, establishing empirical principles that would underpin his later moral and political philosophies. Mill examines how we name things, construct propositions, reason from evidence, and validate assertions. The work addresses both the science of logic and its practical application, emphasizing induction as the central question of logical inquiry.