The Development Theory: A Brief Statement for General Readers

50 cents algæ ancestors animal or plant animals animals and plants apes axolotl become beginning birds body Boston brain breed brine-shrimps carboniferous cause cell cenozoic changes color common condition continent creation Dana's Manual Darwin descent development theory dicotyledons domestic earth embryo Eohippus eozoic Europe evidence evolution example fact fauna feet female fishes flint flowering plants fossil genera genus geological age Haeckel HANDBOOK Hipparion horse human hundred illustration insects instance islands kind known latter LEE & SHEPARD less life-history living lizards lower animals mals mammals Manual of Geology mesozoic microscopic natural selection naturalists Neanderthal O. C. Marsh organs Origin of Species period pollen produced Professor quoted rabbits races regard region reptiles resemblance result river-drift says seeds sexual shells silurian skull snails spores striking sub-kingdom teeth thing tion toes trees tropical variations varieties vary vegetable vertebrates Wallace wild species