Aug. 2. I920 Daily Development of Kernels of Hannchen Barley 417 



Tabl^ IV. — Average percentage of dry -matter and water per kernel in Hannchen barley, 

 percentage of nitrogen and ash in dry matter, ayid actual total weight, weight of dry 

 matter, water, nitrogen, and ash in 12-hour and 24-hour periods at Aberdeen, Idaho' 

 in igij — Continued 



24-HOUR PERIODS 



Time. 



Ash. 



July 15- 

 16. 



17- 

 18. 

 19. 

 20. 

 21. 

 22. 



24. 



25- 



26. 



27. 

 28. 

 29. 

 30- 



Aug. I.. 



2. . 

 3-- 

 4-- 

 S-- 

 6.. 



7-- 

 8.. 



Mgm. 



CHANGES IN WET WEIGHT PER KERNEL 



The trend of the wet weight is indicated in Table III and is summarized 

 in Table IV. The course of development is more apparent in figure 9, 

 where the growth of kernels 5,8, and 10 is represented graphically. The 

 most rapid increase occurs in the first 16 days. After this time the loss 

 of water is almost equal to the increase in dry matter. The fifth, eighth, 

 and tenth kernels represent different sections of the spike. The order of 

 weight is reversed during the period of growth. The tenth kernel was 

 the first of the three to be fertilized, and it reaches a constant weight 

 some time before the fifth kernel does. 



The shift of wet weight is much more evident in figure 10, where the 

 weights of all kernels are shown. The trend of development in the wet 

 weight is quite parallel to that of the length, lateral diameter, and dorso- 

 ventral diameter shown in figures 6, 7, and 8. The shift here proceeds 

 toward the base until the fourth kernel is the heaviest, and it is only 

 toward the last that the fifth and sixth kernels become the highest in 

 weight. The wet weight, owing to the difference of moisture content 



