In characterizing the second period in Husser's thought, the first thing that must be established is that he still sees the task of philosophy entirely within the framework of the descriptive psychological analysis of origins, as he had learned it from Brentano. This form of analysis is now applied not to arithmetic but to pure logic. The extensive analyses in the six investigations are undertaken for the sake of the clarification of pure logic. All forms of presentation and judgment must be investigated in a descriptive psychological manner.