704 Wisconsin Academy of Sciences , Arts, and Letters. 
Fig. l. 
Figs. 2-5. 
Figs. 6-8. 
Fig. 9. 
Figs. 10,11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 1-5. 
Fig. 16. 
Figs. 17-20. 
Figs. 21, '22, 24. 
Figs. 23, 25. 
Figs. 26-29. 
Fig. 30. 
Fig. 31. 
Fig. 32. 
Fig. 33. 
Fig. 34. 
EXPLANATION OF PLATE XXXVIII. 
Typical grain from a rhizome of Ganna. 
Series showing development of grain of eccentric form. 
Young grains before formation of violet-staining por¬ 
tion. 
Young grains showing violet portion at center. 
Young grains showing formation of eccentric violet- 
staining layers. 
Eccentric grain in leucoplast. 
Small grain in leucoplast. 
Young grain with leucoplast as thin uniform layer 
around the periphery. 
Young grain with two hila. 
Young grains with two hila each. 
Development of eccentric grain in chloroplast in stem 
of Pellionia Daveauana. 
Chloroplast in leaf of Pellionia Daveauana , fixed at 
the close of a bright day and containing large as¬ 
similation starch grains (x 1,750). 
Chloroplasts from same plant, fixed after ten hours in 
darkness. Fig. 23 shows remnants of starch grains 
remaining. Fig. 25 shows the plastid completely 
freed from starch. 
Starch grains artificially corroded by diastase. 
Corrosion of grain in the plastid. The anterior end 
of the grain is reduced to a point and takes the 
orange stain. 
Compound grain showing orange-stained peripheral 
layer and portion of leucoplast. 
Grain from Dieffenbacliia seguina showing the effects 
of solution and subsequent growth in a new direc¬ 
tion, caused by shifting of plastid. 
Large grain showing leucoplast and orange-stained 
peripheral layer surrounding violet portions of the 
grain. 
Grain showing broad orange layer. 
