Please note that Jung has explained his use of 'libido' in an earlier section of On Psychical Energy, where II. The Application of the Energic Standpoint, (d) 'Energism' and Dynamism says that 'the word 'libido' I do not connect, as I said, a sexual definition, yet it must not therefore be inferred that I exclude a sexual dynamism, more than any other dynamism, as for example the hunger instinct.' and that 'I called attention to my notion of a general life instinct, termed libido, which replaces the concept 'psychic energy' that I used in the Psychology of Dementia Præcox.'
As such I use it as a term for our more mentally encompassing but not necessarily metaphysical 'life instinct' myself.
I have entered the date found for the work's first publication in English.