100 



THE CELL 



C.W. 



FIG. 6. A, embryonic cells from the meristem (growing point) of 

 the root. B, beginning of vacuolation. C, cells from elonga- 

 ting region with larger vacuoles; c.w., cell wall; cyt., cytoplasm; 

 n, nucleus ; no., nucleolus ; v, vacuole. The top right-hand cell 

 in C has been cut and water admitted to the cavity ; the nucleus 

 has absorbed water and burst, a new gel membrane (m) being 

 formed on the surface of the escaped contents in contact with 

 the water, x 660 (after Sachs). 





