84 



GRASSES OP IOWA. 



present in barley and malt. The amount of cane-sugar in bar- 

 ley is given by O'Sullivan as follows: 



Cane-sugar 2.8 per cent to 6.0 per cent 



Maltose 1.3 " " "5.0 " " 



Dextrose 1.5 " " "3.0 " " 



Levulose 0.7 " " "1.5 " " 



O 'Sullivan concluded that the maltose was derived from the 

 starch. 



It may be interesting here to compare the percentage found 

 by Brown and Morris. 



These writers also conclude that the transformed starch is 

 abs jlved from the endosperm by the columnar epithelium of 

 the embryo in the form of maltose, and then is rapidly con- 

 verted into cane-sugar. The main point of difference between 

 the conclusions arrived at by Haberlandt and Brown and Mor- 

 ris are that the former believes that aleurone layer is largely 

 a secreting organ. Brown and Morris say that the absorptive 



