C ortical 



Medullary 



-"Pvth 



E^eCbud) 



SKin 



Cortica.1 



-- -Medullary G 

 eduU&ryC 



FIQ. 105. Illustration showing the internal structure of a potato tuber, and relation 

 to structure of a stem. Note that the inner medullary, corresponding to the pith in a stem, 

 is connected with the eyes of the tuber. The outer portion is riches tin starch and the inner 

 portion poorest in starch. 



