Kant's distinction between intuition and concept or between sensibility and understanding as two stems of human cognition is of vital importance when dealing with the question of the possibility of philosophical heuristics. Directly depending on this premise of Kant's theoretical philosophy, heuristics is defined by Kant as the search for rules based on the given diversity of intuition, a task which within the spectrum of the Kantian faculty of cognition is assigned to reflective judgment. Since according to Kant's famous dictum judgment can only be practiced but not taught, a heuristic within these limitations is possible only to a limited extent. In search of a more effective heuristic there are attempts in Weimar-Jena around 1800 to overcome the theory of the two stems. These attempts are guided by a rehabilitation of the forms of intuitive cognition. Two studies will investigate these issues further. more >>