. Experiments with plants. Botany. 208 EXPEKIMENTS WITH PLANTS of the stomata, as we may observe on very hot days, and especially in hot dry winds. Place the apparatus out of doors in the wind (the hot- ter and drier the wind the better), and observe the effect on the rate of evaporation. On the other hand, the sto- mata open as soon as favorable conditions for starch-making (i. e., the requisite supply of water, 120. Diagram showing in section and surface view the i • i j. form and position of the guard-cells when closed SUUilgnt anO. (heavy lines) and open (light lines). ,1 \ , warmth) retur
. Experiments with plants. Botany. 208 EXPEKIMENTS WITH PLANTS of the stomata, as we may observe on very hot days, and especially in hot dry winds. Place the apparatus out of doors in the wind (the hot- ter and drier the wind the better), and observe the effect on the rate of evaporation. On the other hand, the sto- mata open as soon as favorable conditions for starch-making (i. e., the requisite supply of water, 120. Diagram showing in section and surface view the i • i j. form and position of the guard-cells when closed SUUilgnt anO. (heavy lines) and open (light lines). ,1 \ , warmth) return. The plant has in the stomata and guard-cells an automatic apparatus of great efficiency, yet wonder- fully simple, on whose proper working its very life depends. If we examine a stoma carefully, we see the two sausage-shaped guard-cells filled with green chlorophyll granules, while the surrounding epidermal cells have none. It is on this that their opening and closing depends. Under conditions favorable for starch-making, the guard-cells produce sugar, 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 Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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