On the origin of species by means of natural selection, or, The preservation of favoured races in the struggle for life
Darwin's 1859 On the Origin of Species, published by John Murray in London, a scientific treatise on evolution by natural selection written for naturalists and general readers. Both pictures are diagrams of branching lines drawn across numbered horizontal rows, with lettered groups at the base and tips marked with small labels. A designer might take from them the clean, schematic logic of a tree or network diagram, with thin strokes, repeated forks, and evenly spaced grid rules.
