At the Richmond meeting of the American Association for the Advancement of Science, in December 1938, a day was devoted to general discussion of "The Cell Theory: Its Past, Present and Future." The occasion was a celebration of the one-hundredth anniversary of this theory as propounded for plant cells by Schleiden and applied to animal cells by Schwann. However, as was emphasized by each of the speakers, the ideas exploited by Schleiden and Schwann involved an erroneous conception which had been developed by other men, long before either Schleiden or Schwann appeared on the scene. The celebration consisted, therefore, of putting Mr. Schleiden and Mr. SChwann in their proper places. The report of this discussion makes reading which is both entertaining and enlightening.
Two other symposiums are contained in the volume, one on "Mating Types and Their Interactions in Infusoria," the other on "Chromosome Structure." They are somewhat technical for
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