168 D. H. WENRICH. 



EXPLANATION OF FIGURES. 



PLATE I. 



FIGS. 1-6. From living material. X 1,100. Fig. i, normal shape of green 

 variety showing paramylon granules, p; stigma, s; position of nucleus at n. 

 Figs. 2 and 3 show metabolic form changes. Figs. 46, resting state ; division 

 in Figs. 5 and 6. 



