. Botany for high schools and colleges. Botany. THE PRINCIPAL TISSUES. 81 EcMnocystis, Ecbalium, Vitis, Bignonia, and Calamus Rotang; also Abies pectinata, Larix, Juniperus, Sequoia, and Ginkgo; also Pteris, Osmu7ida, Equisetum, and Lycopodium. ih) By making repeated horizontal sections the horizontal sieve discs may be found and studied, (c) Alcoholic specimens afford much more satisfactory results than fresh ones ; especially is this the case with the more succulent Fig. 71.—Sieve tissue of Pteris aquilina. A, end of a sieve tube isolated by macer- ation J B, portions of two tubes s
. Botany for high schools and colleges. Botany. THE PRINCIPAL TISSUES. 81 EcMnocystis, Ecbalium, Vitis, Bignonia, and Calamus Rotang; also Abies pectinata, Larix, Juniperus, Sequoia, and Ginkgo; also Pteris, Osmu7ida, Equisetum, and Lycopodium. ih) By making repeated horizontal sections the horizontal sieve discs may be found and studied, (c) Alcoholic specimens afford much more satisfactory results than fresh ones ; especially is this the case with the more succulent Fig. 71.—Sieve tissue of Pteris aquilina. A, end of a sieve tube isolated by macer- ation J B, portions of two tubes seen iu vertical section ; in s' the sieve plates are seen m front view ; at c, c, they are seen in section ; the tube s^ has sieve plates on its right and left walls, but none on its further wall, which is in contact with pa- renchyma-cells ; two of the latter are seen to have nuclei in them, x 375,—After De Bary. 107.—Tracheary Tissue. Under this head are to be grouped those vessels which, while differing considerably in the details, agree in haying thickened walls, which are perfo- rated at the places where similar vessels touch each other. The. 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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