  Harley’s research was taken up by the Manchester economist and philosopher William Stanley Jevons (1825–1882). Jevons formulated his philosophy of science, as found in the Principles of Science (1874), against John Stuart Mill’s predominant inductive logic. His alternative to inductive logic was the “Principle of Substitution”. He included a section “Anticipations of the Principle of Substitution”, which was enlarged in the later edition with a long discussion of Leibniz’s anticipations. There he expressed his thanks to Robert Adamson for the information that the Principle of Substitution can be traced back to Leibniz. Jevons asked what were the reasons for the long ignorance of Leibniz’s anticipations. Only Dutens’ edition was available in Owens College Library, Manchester. He regretted having overlooked Erdmann’s edition, but noted that this was also done by other “most learned logicians”.