. Carnegie Institution of Washington publication. I.^Method Chart. a Hypothetical Case ir> iM^ i^W- m mc attempt by connecting high pmnu in Procession Index (P. I.) Com- plete corrections made for dilTorences in (n) size of &amplo and (b) variatione in Mitotic Indices and (o) Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington

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