— K.+Cot. 

 c. 



+K.+Cot. 

 a. 



PLATE II. 



K.— Cot. 

 d. 



+K.— Cot. 

 b. 



EXPLANATION. (See p. 213.) 

 Water-cultiu'es of Flowering Bean after vegetating 38 days, 

 a. In normal solution, seed with cotyledons, 

 t). In normal solution, seed without cotyledons. 



c. In potassium-free solution, seed with cotyledons. 



d. In potassium-free solution, seed without cotyledons. 



