ABSTRACT
This chapter is concerned with a narrowly restricted problem to formulate precisely certain principles involved in the determination of causal factors within a limited field of research. It describes the standpoint of scientific inquiry which undoubtedly makes some assumptions. The chapter examines at some length an experimental investigation carried out by the famous French scientist Louis Pasteur. It considers J. S. Mill's 'fifth method', which must be stated before an attempt is made to estimate the purpose and the value of Mill's formulation of the 'methods'. It is important to remember that Mill defined logic as the science of proof. He insisted that it is 'the business of Inductive Logic to provide rules and models to which, if inductive arguments conform, those arguments are conclusive and not otherwise'. Much of the difficulty in Mill's conception of scientific method is due to the fact that he believed both of two mutually inconsistent propositions.
