STUDIES ON MITOCHONDRIA IN PLANT CELLS. 2OI 



EXPLANATION OF PLATES. 



All the figures have been drawn with the aid of a Zeiss apochromatic 1.5 

 mm. objective, a Spencer ocular No. 10 and a camera lucida. 



Cortical cells, 'between the root-cap and the elongating portion of the sprout- 

 ing pea radicle, were selected. The radicles were fixed by the Regaud for- 

 malin-bichromate method and the sections stained with iron hematoxylin. 



