In subsequent editions of "The Origin of Species", Darwin acknowledged Matthew's earlier work, stating that Matthew "clearly saw...the full force of the principle of natural selection". It is an urban myth that, from 1860 onward, Matthew would claim credit for natural selection and even had calling cards printed with "Discoverer of the Principle of Natural Selection." This probably started with Loren Eiseley (1958. Darwin's Century), who apparently misunderstood a comment made by Darwin in a letter to Hooker (22 and 28 October 1865). Concerning the finding that William Charles Wells had published the idea of evolutionary change through natural selection before Matthew, Darwin wrote to Hooker: "So poor old Patrick Matthew, is not the first, & he cannot or ought not any longer put on his Title pages "Discoverer of the principle of Natural Selection"!" However, this was already inaccurate on Darwin's part. What the title page of Matthew's pamphlet "Schleswig-Holstein" really said was: