THE SPERMAPHYTES. 



235 



various tissues of the stem that have already been studied. 

 Notice also, particularly, that the meristematic cells are 

 identical in their nature and function with those of the 

 cambium layer. 



12. Cut transverse, radial, and tangential sections of 

 the roots of the plants that have been used in Numbers 

 3 to 11, using both young and old portions of the roots. 

 Are the fibro- 



vascular bun- 

 dles continued 

 into the roots ? 

 If so, do you 

 find that they 

 here exist in a 

 modified form? 

 Compare each 

 section with the 

 corresp onding 

 section of the 

 stem of the same 

 plant. Do you 

 find chlorophyl? 

 Do you find pro- 



, FIG. 157. Bristly Sarsaparilla, showing the anomalous 

 toplasm in the arrangement of the fibro vascular bundles, (x 35.) 



cells of the root? 



If so, in what parts? Treat with iodine. Do you find 



a nucleus and nucleolus ? Starch ? 



13. Germinate beans of some large variety until the 

 radicle is enlarged and is in an actively growing con- 

 dition. Imbed radicles in paraffin or celloidin, and cut 

 longitudinal median sections. Make out the rootcap. 

 Just back of this and near the apex of the root proper 

 find the growing point. Notice the thin-walled cells of 

 the meristem that have resulted from recent divisions of 

 the cells at the growing point. Trace these cells up 



