that it will germinate at higher temperatures with the coats removed than with the coats on. It was found that if seeds are soaked for a half hour the coats can be. separated into three distinct coverings. Removal of the outer two has no influence on the germination of seeds at high temperature but when the innermost is removed germination proceeds normally as shown in figure 23. This result suggested the desira.bility of making a study of the development and structure of these parts of the seed. J ones"? describes the general morphology of the lettuce akene, but gives no details as to the development of the pericarp and other coats surrounding the embryo.
2 Professor of Botany and Botanist in the Experiment Station. 3 See "Literature Cited" at the end of this paper for complete data on citations, which are referred to in the text by author and date of publication. References to individuals not accompanied by date, in parentheses, pertain to personal correspondence, or to herbarium specimens.
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