Mitotic stages in red bone marrow.
Mitotic stages in testis of mouse t.s.
Sea-urchin cleavage stage.
Growing egg in ovary of bird t.s.
Plant mitosis, l.s. of onion root tips.
Plant stages in red bone marrow.
Growing tissue in stem apex l.s.
Growing leaf tissue in shoot apex t.s.
Plant meiosis t.s. young Lilium anthers.
Mature pollen grains of Lilium w.m.