Nov. 19, 1921 Ash Content of Awn, Rachis, and Palea 



443 



of the awns, paleas, and rachises, this is probably the best method of 

 comparison. These organs do not increase perceptibly in size during 

 the time the deposit of ash is taking place. In the awns the deposit 

 probably consists of ash eliminated from the cell sap. In consequence 

 of this very heavy deposit, the ash in the awn reaches a percentage of the 



6,0 



7.0 



6,0 



k 



6,0 



^.0 



ao 



2.0 



10 







15. W7 /<? /SaOZI^JS^ Z^Z5g6Zr,Zd.&^^^ I ;S 3 ^ 6 6 7 6 



Fig. 3.— Percentage of ash in barley kernels, computed on the basis of dry matter (solid line), water (broken 



line), and wet weight (dots and dashes), from fiowering to maturity, at Aberdeen, Idaho, 1917. 



total weight which overshadows any variation of sample or defect of 

 method in calculation. In the case of the kernel it is not thought that 

 the dry matter is a desirable basis of computing ash. When computed 

 on this basis, as will be seen in figure 3, the ash content at flowering time 

 is very high. In most determinations it has been around 8 per cent at 

 this period of growth. 

 07495°— 21 5 



