43S ELEMENTARY BIOLOGY. [CIIAP. 



Ccach cell; the position of these granules, in 

 the more superficial layer of the protoplasm. 



8. The protoplasmic movements (see C. n.). 



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. lis form: hemispherical, the rounded surface 

 free ; the flat surface attached to the cell 

 below it. 



p. Stnicture: sac, protoplasm, nucleus; no vacuole- 

 present. 



y. Sometimes two nuclei, preliminary to division. 



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

 the stem, giving rise to two superimposed 

 nucleated cells. 



b. The fiu't her fate of the new cells derived from 

 the segments of the terminal cell; Avork back in 

 your specimens from the terminal cell. 



cu The new cells are successively nodal and inter- 

 nodal ; the latter enlarge, develope a large 

 vacuole, and ultimately form the medullary 

 cells of the internodes; they never divide. 



y3. The nodal cells divide freely, and do not 

 increase much in size; they give origin to the 

 nodes and the cortical cells. 



c. The drc'elopment of Ica-t'cs: by the multiplication 



and outgrowth of nodal cells. 



