 Within this classification of sciences, philosophy is meant to be the ultimate science responsible for the issues common to all sciences, i.e. to the natural and human sciences as a whole, but which are not specifically handled by any per se. That is why philosophy is considered the most general science of all sciences, and is defined “as the science of the most general laws of the mental and of those of reality in general” (Stumpf, 1906a, p. 91). Stumpf reiterates this position in his autobiography: