Aug. 2, 1920 Daily Development of Kernels of Hannchen Barley 427 



structure. The fifteenth or sixteenth day marks what probably is the 

 most important change in the course of development. Among the inter- 

 nal changes, this date coincides with the maximum water content of the 

 kernel and the end of the period of most rapid increase in dry matter 

 and ash. Schjeming found a drop in the soluble nitrogen present in the 

 kernel at about this time. 



From the fifteenth or sixteenth day until maturity the changes are 

 gradual and all in the same direction, differing only in degree. The 

 only point now apparent, which might mark a change of nutrition, is to 

 be found in those varieties which develop anthocyanin colors in the 



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27 



Fig. 17.— Periods of development of the barley kernel as indicated by records during three years at 



Aberdeen, Idaho. 



external layers a few days before maturity. This is probably a very 

 minor phase of metabolism, and at present it is not known to be asso- 

 ciated with any vital phase of growth or maturation. The various 

 external indices of internal changes are shown in figure 17. 



MORPHOLOGICAL CHANGES 



Microscopical examination of the kernel was made to determine the 

 progress of the internal modifications that must accompany develop- 

 ment. The starch infiltration is shown in various stages in Plates 85 to 

 91. Starch was found on the fourth day. This had increased per- 

 ceptibly on the sixth day. The starch grains up to this time seemed 



