It came back toward Berlin in the year following, and same that was not custom of the German universities to destine important positions the Jews, Cassirer became professor instructor (Privatdozent) in the University of Berlin, where it remained per thirteen years. It published, in 1910, ' ' Substncia and Funo' ' , and in 1918, ' ' Kant. Vida and Pensamento' ' , a compendium of studies on the life and the philosophy of Immanuel Kant (1724-1804). Soon more, it received the invitation to occupy two chairs in the just-established University of Hamburg, where it remained until the beginning of years 30. In this half time, the 1 school of Marburg produced many texts is a great symbol of the neokantismo, and classifies such chain, in first place, as a theory of science, accenting the logical unit it thought. The inversion proposal for Kant, who instead of considering the scientific knowledge as a study of thing-in-itself what she enters in vigor is the questioning of the proper citizen, inspired philosophers as Cohen to adopt the kantiano method, and more than this, to exceed the proper kantismo, reducing to the philosophy to the one theory of the scientific knowledge, concentrating themselves in the conditions of the knowledge of the things, and not of the proper things. The school of Marburg follows this logical-objetivista tradition, and Cassirer did not follow such tradition to the scratch, and sample of this is that later it came if to interest for historical and cultural perspectives that refer to the human being. 8 academics and became related with other thinkers of great importance, as Albert Einstein (1879-1955) and Martin Heidegger (1879-1976). Moreover, it was in this half time that Cassirer published three volumes of the Philosophy of the Simblicas2 Forms, one of its main workmanships, in which still it displays some aspects neokantianos, as the consideration of that our conceptual structure is the key for the understanding of the world where we live.