. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 50 Principles of Plant Culture. The guard-cells are delicately-balanced valves which are extremely sensitive to external influences. They are open in strong light, but usu- ally closed in darkness and when the leaves are wet. The water es- caping from leaves (75), and the car- bonic acid en- tering them (62) mostly Fig. 18. Showing stomata(.s-/.) on leaf of the garden pgjgg through beet. Moderatelymagnifled. {AfterFankandTschlrch). See also Figs. 1.
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 50 Principles of Plant Culture. The guard-cells are delicately-balanced valves which are extremely sensitive to external influences. They are open in strong light, but usu- ally closed in darkness and when the leaves are wet. The water es- caping from leaves (75), and the car- bonic acid en- tering them (62) mostly Fig. 18. Showing stomata(.s-/.) on leaf of the garden pgjgg through beet. Moderatelymagnifled. {AfterFankandTschlrch). See also Figs. ,19 and 22. tllC Stomata. The slightly-raised spots or dots on the smooth bark of the young shoots of many woody plants, (lenticels (len'-ti- cels)), serve a similar purpose to the 67. The Growing Point. At the tip of the stem and just be- hind the tip of the root, is a group of cells forming the so- called growing point. These cells divide very rapidly during the growing season, and from them all other kinds of cells are evolved. W Fig. 19. Showing stomato [st.) on leaf of Oldenburgh apple. Highly 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. , The Author
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