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Ultrathin sections of Saccharomyces cerevisiae, grown on Lindegren's presporulation medium, have been studied with the electron microscope. A cytoplasmic membrane, mitochondria, nucleus, central vacuole, storage granules, and an internal double membrane system have been described. The cytoplasmic structures observed resemble closely analogous structures described in thin sections of cells from a variety of other sources.

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Studies of the photoheterotrophic, or nonsulfur purple, bacteria have shown that these microorganisms are closely related morphologically, and can be placed either in the genus Rhodospirillum or Rhodopseudomonas (van Niel, 1944). These two genera comprise the family Athiorhodaceae. In view of the morphological

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