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the epidermal surface facing upwards, including cell walls and mitotic figures. The best photographs were those obtained immediately following the staining, since after a few hours the stain tended to diffuse. In preparation for sectioning, apical meristems were fixed in either Carnoy’s or Navashin’s fixative. They were then dehydrated, using the tertiary butyl alcohol series, embedded in par- aftin, and sectioned longitudinally at a thickness of
Stebbins et al. (Fri,) studied this question.