Mitotic stages in red bone marrow of a mammal – Mitotic stages in testis of mouse t.s. (meiosis) – Development of sea-urchin egg, cleavage stage – Growing egg in ovary of bird t.s. – Plant mitosis, l.s. of onion root tips – Plant mitosis, angular vision of onion root tips – Growing tissue in asparagus stem apex l.s. – Growing pine leaf tissue in shoot apex t.s. – Plant meiosis, t.s. young Lilium anthers – Mature pollen grains of Lilium w.m.