{"slug":"paper-darwin-c-1859-on-the-origin-of-species-by-means-of-natural-selection-or-the-pres","verification":{"valid":false,"broken_at":0,"reason":"hash mismatch"},"count":2,"sources":[{"id":"s1","type":"other","url":"https://darwin-online.org.uk/content/frameset?itemID=F373&viewtype=text&pageseq=1","title":"Darwin, C. R. 1859. On the Origin of Species... First edition full text","quote":"This principle of preservation, I have called, for the sake of brevity, Natural Selection.","summary":"Primary source of the 1859 text containing all key passages and the diagram description.","claim_ids":["c1","c2","c7","c5"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-08T07:54:20.487Z","link_status":"ok","quote_status":"unverified","prev":"genesis","hash":"860fc824bf842406831f636e6eaf3dc34e5ef7abe2b0c586cbf8817600ca3027"},{"id":"s2","type":"other","url":"https://darwin-online.org.uk/EditorialIntroductions/Chancellor_vanWyhe_Origin1st.html","title":"Introduction to Origin of species, first edition - darwin-online.org.uk","quote":"As buds give rise by growth to fresh buds, and these, if vigorous, branch out and overtop on all sides many a feebler branch, so by generation I believe it has been with the great Tree of Life, which fills with its dead and broken branches the crust of the earth, and covers the surface with its ever branching and beautiful ramifications.","summary":"Editorial source confirming the Tree of Life passage and diagram location in Chapter IV.","claim_ids":["c3","c4"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-08T07:54:20.487Z","link_status":"ok","quote_status":"verified","prev":"860fc824bf842406831f636e6eaf3dc34e5ef7abe2b0c586cbf8817600ca3027","hash":"5da443f9f97183a76fec8254adb7d5619cbd2013441018b6c2e890bc0dc1b8bf"}]}