And with this famous entry in his notebook, he begins in the top left-hand corner with, "I think," and then sketches out the first tree of life, which is his perception of how all the species, all living things on Earth, are connected through evolutionary history -- the origin of species through natural selection and divergence from an ancestral population.
S ovim glasovitim unosom u svoju bilježnicu, on počinje u gornjem lijevom kutu sa, "Mislim", a zatim skicira prvo stablo života, koje je njegovo viđenje o tome kako su sve vrste, sva živa bića na Zemlji, povezana kroz evolucijsku povijest -- podrijetlo vrsta putem prirodne selekcije i odstupanje od rodovske populacije.