LLOYD. 



PLATE 4. 



1. Stomata of Fouquieria splendens nearly closed, 4h34 m a. m. 



2. Partly open, 7 a. m. 



3. Open, noon. 



4 and o. Stomata of Tradescantia zebrina in closed and open condition. 



All fixed by absolute alcohol, stained with Congo red, and mounted in balsam. 



