Abstract
The following have been presented: 1. An analysis of the conditions upon which the theory of sex chromosomes rests. 2. Evidence against the idea of synapsis. 3. A study of the peculiar systematic and cytological characteristics of the fifty species of Angiosperms for which sex chromosomes have been described. 4. Discussion of the probable fallacy of assuming that any of these fifty species possess a sex which is completely homozygous to sex. 5. An interpretation of the phenomenon now classified as sex chromosomes which is believed to be more in keeping with the facts.

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