Versimilitude is when the appearance of 'reality' is given in a book.When we study a book that is from a long gone generation, you really have to take into account what was happening evolutionally with the literary genre. Defoe achieves versimilitude in Robinson Crusoe by bringing in various scenes which depict a real need for Robinson on the island. We, the readers, buy into this because of course this is something that 'we' would do in this situation. A specific example would be that whole early scene where he is salvaging items from the shipwreck and it takes a long time.