43 8 ELEMENTARY BIOLOGY. [CHAP. 



each cell; the position of these granules, in 

 the more superficial layer of the protoplasm. 



8. The protoplasmic movements (see C. a.}. 



c. The terminal bud. 



Dissect out chromic acid specimens as far as pos- 

 sible with needles, and then press gently out in 

 glycerine. Note in different specimens 



a. The terminal or apical cell: 



a. I\sform: hemispherical, the rounded surface 

 free; the flat surface attached to the cell 

 below it. 



(3. Structure: cell- wall, protoplasm, nucleus; no 



vacuole present. 

 y. Sometimes two nuclei, preliminary to division. 



8. Its mode of division; across the long axis of 

 the stem, giving rise to two superimposed 

 nucleated cells. 



b. The further fate of the new cells derived from 

 the segments of the terminal cell ; work back in 

 your specimens from the terminal cell. 



a. The new cells are successively nodal and inter- 

 nodal, one nodal and one intemodal cell being 

 formed from each segment; the intemodal 

 cells enlarge, develope a large vacuole, and ul- 

 timately form the medullary cells of the inter- 

 nodes ; they never divide. 



ft. The nodal cells divide freely, and do not 

 increase much in size ; they give origin to the 

 nodes and the cortical cells. 



c. The development of leaves : by the multiplication 

 and outgrowth of nodal cells. 



