348 



BOTANICAL GAZETTE 



[novemb 



ous radial clefts or channels. 



(/<r. 



does not 



appear to take up these stains as readily as either wheat starch 

 or potato starch, and there is no differentiation of the lamellae. 



II 



\A 



?o 



12 



18 



21 



i9 



22 



Figs, i 1-22. — Wheat starch grains ; 11-20, showing the effect of chromic 

 acid and other swelling reagents ; 21-22^ showing a direct disintegration ot 

 the grains through the action of ferments. 



This is probably due to the peripheral layers being denser and 

 less permeable. Salter (28) in speaking of the staining of the 

 grain says that it is dependent upon the absorption of the ani- 

 line dye, and that in no case does it seem to have a selective or 



I 



