. The essentials of botany. Botany. 50 BOTANY. of one or more tissues; this redaction may be so great as to leave but a single tissue, which in many cases is com- posed of only a few spiral ves- sels or tracheids (Fig. 32). In other cases, instead of spiral vessels the bundle may consist of a few fibres of bast; or of elongated, thin - walled cells, which are doubtless to be re- garded as meristem-cells which failed to fully change into one of the ordinary permanent tis- sues: this last is a very com- mon accompaniment of reduced bundles. Practical Studies. â (a) Break a stem of the Indian cor
. The essentials of botany. Botany. 50 BOTANY. of one or more tissues; this redaction may be so great as to leave but a single tissue, which in many cases is com- posed of only a few spiral ves- sels or tracheids (Fig. 32). In other cases, instead of spiral vessels the bundle may consist of a few fibres of bast; or of elongated, thin - walled cells, which are doubtless to be re- garded as meristem-cells which failed to fully change into one of the ordinary permanent tis- sues: this last is a very com- mon accompaniment of reduced bundles. Practical Studies. â (a) Break a stem of the Indian corn and note â with the naked eye tlie tough string- like flbro-vascular bundles wliich run through the soft tissues. Examine in like manner the fibro-vascular vSSlS-T;?X??i'l°?iaTre<S bundles of the common door-yard to tracbeids and spiral vessels. Plantain. (6) Make a very thin cross-section of tlie stem of Indian corn and, using tlie microscope, study the bun- dles (.â¢arefully by comparing with Fig. 35. In bundles from young siirns the fll)rous tissue will not show as good a development as In Irii' fisure. (c) Now make thin longitudinal sections of a bundle in such a man- ner as to have the sections pass through a and i in the figure. This may \v done by slicing the stem in a longitudinal radial direction. Study again by comparison with the figure and with the previous specimen. (d) Make thin longitudinal sections of a bundle at right angles to the last (by longitudinal tangential sections of the stem). (e) Study In like manner the bundles of sugar-cane and asparagus. (/) Study by similar sections the Imndles of the young stem of. 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 E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
Size: 1156px × 2162px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
