146 THE MOLECULAR ARCHITECTURE OF PLANT CELL WALLS 



TABLE XI 



Shrinkage and swelling of the wall bars of collenchyma cells of 

 Petasites vulgaris L. as seen in transverse section 



TABLE XIa 



Length changes in collenchyma cells o/" Petasites vulgaris 



on dehydration and subsequent hydration. 



Lengths are given in mm. 



TABLE XII 



The major extinction position in collenchyma cells. 



The figure gives the angle in degrees between the 



direction of the m.e.p. and cell length 



