These assumptions concerning the chemical basis of the sexual excitement are in full accord with the auxiliary conception which we formed for the purpose of mastering the psychic manifestations of the sexual life. We have determined the concept of libido as that of a force of variable quantity which has the capacity of measuring processes and transformations in the spheres of sexual excitement. This libido we distinguished from the energy which is to be generally adjudged to the psychic processes with reference to its special origin and thus we attribute to it also a qualitative character. In separating libidinous from other psychic energy we give expression to the assumption that the sexual processes of the organism are differentiated from the nutritional processes through a special chemism. The analyses of perversions and psychoneuroses have taught us that this sexual excitement is furnished not only from the so-called sexual parts alone but from all organs of the body.
We thus formulate for ourselves the concept of a libido-quantum whose psychic representative we designate as the ego-libido; the production, increase, distribution and displacement of this ego-libido will offer the possible explanation for the observed psycho-sexual phenomena.
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