Aug. 2. I920 Development of Barley Kernels in Clipped Spikes 467 



The ash was determined in more organs at Aberdeen than at St. 

 Paul. The percentage of ash in the rachis, paleae, and awns is shown 

 in figure 10, as well as the ash in the kernel. The analysis of the other 

 structures throws much light on the problem. The awn contains a 

 surprising amount of ash. At flowering time 10 per cent of its dry 

 weight is ash, while at maturity 33 per cent of the dry weight is ash. 



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Fig. 10. — Graph showing percentage of ash in the kernels, rachises, paleae, and awns of normal spikes of 

 Hannchen barley and in the kernels, rachises, and paleae of clipped spikes. 



The total amount of ash present is considerable. The percentage of 

 ash in the kernels of the clipped spikes is about the same as in those of 

 the normal spikes. The paleae of the clipped spikes contain more ash 

 than those of the normal spikes. 



It is in the rachis that the greatest and most significant difference 

 occurs. The rachises of the clipped spikes contain 25 per cent more 

 ash than the rachises of the normal spikes. It would seem that much 



