Kurt Goldstein (1878-1965) The Organism (1939)
A Holitstic Approach to Biology Derived from Pathological Data in Man
Chapter three. Theoretical reflections on the function of the nervous system as foundation for a theory of the organism the nervous system a network. The course of excitation in such a system
...The above-mentioned maintenance of a relative constancy, distinctive to each organism, is only possible when there is a definite configuration of the stimuli, i.e. of the milieu. Actually, only such events which make the above-discussed equalization possible belong to the milieu of the organism, exist for it as a stimulus, and lead to the experience of definite contents.
...We must make a clear distinction between the surrounding world, in which the organism is located, and the milieu which represents only a part of the world-that part which is adequate to it, i.e. which allows for the described relationship between the organism and its environment. Each organism has its milieu, as Uexkuell has emphasized.