224 
The  Structure  of  the  Starch  Grain. 
Am.  Jour.  Pharm. 
May,  1907. 
ipheral  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  anilin  dye,  and  that  in  no  case  does  the  dye 
20 
Figs.  11-22. — Wheat  starch  grains  ;  11-20,  showing  the  effect  of  chromic  acid 
and  other  swelling  reagents  ;  21-22,  showing  a  direct  disintegration  of  the 
grains  through  the  action  of  ferments. 
seem  to  have  a  selective  or  specific  action  on  the  layers.  The 
figures  of  Salter,  however,  show  that  the  stain  is  taken  up  by  certain 
