The reference is to H . G. Wells’s science fiction novel The Time Machine (London: William Heinemann, 1895).
Jung had some contact with Wells.
It seems that they met on one of Jung’s trips to London.
In 1926, Wells presented a striking account of a meeting with Jung in his book The World of William Clissold (London: Ernest Benn), pp. 91-96.
In 1929, Jung wrote to Walter Corti mentioning that he had recently met Wells at his house in Kusnacht, and recommended that Corti publish a translation of Wells’s God, the Invisible King (London: Cassell, 1917); see Letters l , p. 69 .
Also see Vincent Brome, “H . G. Wells and C. G. Jung,” Spring: An Annual of Archetypal Psychology and Jungian Thought (1975) : 60-62.
Jung described his impressions of Wells to Aniela Jaffe (MP, p. 13). ~The Black Books, Vol. VII, Page 202, fn 143