-K.+Cot. 



PLATE II. 



EXPLANATION. (See p. 213.) 

 Water-cultures of Flowering Bean after vegetating 



a. In normal solution, seed with cotyledons. 



b. In normal solution, seed without cotyledons. 



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



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



