Keywords: Darwin tree cut.png en Charles Darwin's 1837 sketch his first diagram of an evolutionary tree from his First Notebook on Transmutation of Species 1837 on view at the the Museum of Natural History in Manhattan Interpretation of handwriting I think case must be that one generation should have as many living as now To do this and to have as many species in same genus as is requires extinction Thus between A + B the immense gap of relation C + B the finest gradation B+D rather greater distinction Thus genera would be formed Bearing relation next page begins to ancient types with several extinct forms 2012-03-05 http //www english uga edu/nhilton/4890/darwin/DarwinTree html Creator Charles Darwin PD-old-100 Notebooks by Charles Darwin Evolutionary biology Phylogenetics Uploaded with UploadWizard |