In this chapter I will raise the question what consequences the new doctrine of the intuition of essences has for logic. The development of Husserl's thought can be traced in concreto in connection with this formal a priori science. I have already devoted a paragraph to this matter in Chapter 4 of Part I. Husserl hoped to achieve two things in LU. In the Prolegomena to Pure Logic, he sought to place logic on a firm, non-psychological basis, and in the six investigations, he tried to clarify its fundamental concepts. In this chapter I will examine how Husserl carried out the former task. Then, in Chapter 5, I will discuss the philosophical analysis of origins.