1. The first volume contains a forceful attack against psychologism.

2. In logical area, psychologism recommands that the study of logic should rely on psychologism.

3. This paper begins with the psychologism in logical area in Frege's time, and states the three steps of Frege's working for his target that building mathematics on logical foundation.

4. The author try to understand Husserl s argument in criticizing the fact-superstition which have been permeating into contemporary naturalism, historicism and psychologism.

5. The pre-Kant's aesthetics was based on scientism which divided the world into two parts: subject and object. Entitism and psychologism were its methodological principles.

6. John Stuart Mill's philosophy of logic has always been regarded as the main representative of psychologism.

7. This paper also states "the third area" theory of late Frege for the purpose of instead of psychologism.