706 Wisconsin Academy of Sciences , Arts, and Letters. 
EXPLANATION OF PLATE XXXIX. 
Fig. 35. Grain showing orange layer divided at posterior por¬ 
tion of grain by narrow violet layer. Grain sur¬ 
rounded by thin leucoplast. 
Fig. 36. Outer violet layer completely surrounding violet por¬ 
tions of the grain. 
Fig. 37. Grain showing thin leucoplast entirely surrounding 
grain and broad orange peripheral layer. 
Fig. 38. Grain showing leucoplast as thin layer on periphery; 
a broad orange layer, separated from a pale orange 
layer at the posterior end of the grain by a crescent¬ 
shaped band of violet-staining starch. 
Fig. 39. Grain showing the effect of normal corrosion in the 
plastid. 
Figs. 40, 41. Corroded grains from germinating w r heat. 
