Abstract
1. A study was made of the number, size, and periodicity of the stomata of five species of grass. 2. The stomata of the five species showed a definite periodicity, being open during the day and closed at night. 3. The species showed considerable differences in the percentage of stomata open at the same period. 4. The fescue possessed fewer stomata per unit area than did either the bent or the bluegrass.
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