. Nature and development of plants. Botany. Fig. 20. Fig. 20. Shoot of wild lettuce, Lactuca, with leaves turned edgewise to the light. Fig. 21. Position 6f young leaves of hickory: A, scales of bud curving back showing the tightly folded leaves. B, later stage, leaves unfolding but still erect. least three different positions during their growth. The folding of such leaves and their erect positions expose less surface. They consequently lose less heat and moisture, and the delicate grow- ing cells are better protected against the intense sunlight. You must notice as the cells mature and becom
. Nature and development of plants. Botany. Fig. 20. Fig. 20. Shoot of wild lettuce, Lactuca, with leaves turned edgewise to the light. Fig. 21. Position 6f young leaves of hickory: A, scales of bud curving back showing the tightly folded leaves. B, later stage, leaves unfolding but still erect. least three different positions during their growth. The folding of such leaves and their erect positions expose less surface. They consequently lose less heat and moisture, and the delicate grow- ing cells are better protected against the intense sunlight. You must notice as the cells mature and become better protected that their irritability changes and they respond in a different way to light and gravity, etc. They begin to unfold and turn away from their erect positions and at maturity assume a fixed posi- tion to light, etc., that is quite different from the original posi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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