TISSUE OF CELLS. 



being variously compressed. In several instances, the 

 cells are oblong, as in the roots of parsley. 



Oblong cells from the bark of a kidney bean magnified. 



Compression of a different kind produces twelve- 

 sided figures, which, on being cut across, appear to be 

 six-sided, like a honeycomb; as may be seen in a thin 

 slice of alder pith and in the bark of many plants. 



Six-sided cells magnified. At the junction of the four cells, 

 towards the left, a square intercellular passage is represented. 



