A System of Logic : Ratiocinative and Inductive.

A System of Logic : Ratiocinative and Inductive. Being a connected view of the principles of evidence and the methods of scientific investigation.

In this work, he formulated the five principles of inductive reasoning that are known as Mill's Methods. This work is important in the philosophy of science, and more generally, insofar as it outlines the empirical principles Mill would use to justify his moral and political philosophies.