LIVING PARENCHYMA 



271 



become chloroplasts. Certain adult living cells, how- 

 ever, differ in one way or another from this typical 

 structure. 



Fig. 42. — Development of adult liying cells (parenchyma) from 

 embryonic cells. A, embryonic (m^eristematic) cells. B, begin- 

 ning of vacuolation. C, fully grown cells (here much elongated) 

 with characteristic large central vacuole; c.w., cell wall; cyt., 

 cytoplasm ; n, nucleus ; no., nucleolus ; v, vacuole. 



