ABSTRACT
This chapter discusses the issue of unity of science that concerns the subject of language in many ways. The unity of scientific language would reflect, and guarantee, the alleged unity of science, beside the apparent linguistic diversity that marks every discipline. The chapter considers the positions of two eminent philosophers: on the one hand, Jerry Fodor, dealing with an alleged mental language supporting the development of our natural languages; on the other hand, Rudolph Carnap, whose proposal is about the general structure of scientific language. The philosopher Jerry Fodor approached the issue of mental processes by using the concept of mental representation. Folk psychology is the perspective according to which the reference to mental states is useful in order to predict and explain behaviors of others and of oneself. The philosopher Rudolph Carnap believed that human knowledge begins with the inquiry into what people experience with their senses.
