The publisher John Murray made an offer of payment for a revised second edition of "Journal and Remarks", diverting Darwin's attention from "South America". On 25 April Darwin began extensive revisions incorporating his latest information and interpretations, including several hints about his species speculation. He now saw the Galápagos Archipelago as "a little world within itself, or rather a satellite attached to America, whence it has derived a few stray colonists," where we were "astonished at the number of their aboriginal beings, and at their confined range", and "seem to be brought somewhat near to that great fact – that mystery of mysteries – the first appearance of new beings on this earth." On 5 August Darwin began reading Lyell's "Travels in North America", and was horrified that it saw no harm in slavery. He added two new paragraphs to his "Journal", cataloguing atrocities after stating "I thank God, I shall never again visit a slave-country", and finished his revisions on 26 August.