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and phosphates of lime, magnesia, and potash—just as there are in ordinary well-water. This extremely dilute solution passes into the root-fibers and up through the

Fig. 23.—A. A small piece of the lower epidermis removed (and highly magnified) to show the stomata, g; h, minute hairs. The guard-cells contain chlorophyll corpuscles, whereas the ordinary epidermal cells do not. B. A stoma in vertical median section, cut across its longer axis: a, intercellular space: g, guard-cell with chlorophyll corpuscles; s, orifice of stoma.

vessels, etc., of the vascular bundles of the roots, collecting into the larger and larger channels until it reaches