. Plant life, considered with special references to form and function. Plant physiology. THE LEA VES. 127 the large vein and end free (fig. 149). In the first type the finest branches of the \-eins, too delicate to be seen without the microscope, often end free in the meshes formed by the next larger branches (fig. 164). Near the margin of a blade. Fig. 150. Fig. 151. Fig. 150.—Parallel venation of leaf of Pcly^onatufii lati/climn. Natural size.— .^ter Ettingshausen. Fig. 151.—Pinnately netted venation of leaf of a -n-illow. Xatural size.—Afier Ettings- hausen. the larger veins are often so co
. Plant life, considered with special references to form and function. Plant physiology. THE LEA VES. 127 the large vein and end free (fig. 149). In the first type the finest branches of the \-eins, too delicate to be seen without the microscope, often end free in the meshes formed by the next larger branches (fig. 164). Near the margin of a blade. Fig. 150. Fig. 151. Fig. 150.—Parallel venation of leaf of Pcly^onatufii lati/climn. Natural size.— .^ter Ettingshausen. Fig. 151.—Pinnately netted venation of leaf of a -n-illow. Xatural size.—Afier Ettings- hausen. the larger veins are often so connected with each other as to form one or more series of arches whose convex side is directed toward the margin. These forma sort of selvedge and protect the leaf against tearing (fig. 153). / C -. 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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