O. N. Purvis 



357 



Mayl6 



31 Junes IS 2.6 



Fig. 6. Mean thickness of walls in sclerenchyma. 



Full line ^— Plot 7, with added potassium salts. 

 Broken line - - - Plot 8. without added potassium salts. 



J^- 



10/n. 



Mayl6 



Fif 



51 Junes 15 A6 



7. Mean diameter of luniina in sclerenchyma. 



Full line — ^ Plot 7, with added potassium salts. 

 Broken line - - • Plot 8, without added potassium salts. 



Jom'U. of Agric. Sci. ix 



24 



