Preface by the editor on the true concept of natural philosophy and the correct way to resolve its problems (1801). From: Presentation of my system of philosophy (1801). From: Further presentations from the system of philosophy (1802). On the study of philosophy in particular. From: Lectures on the method of academic study (1803). Philosophy of art (1802/1803). On the science of art, in relation to academic study. From: Lectures on the method of academic study (1803). On the relationship of the fine arts to nature (1807). Content Volume 1-6.