4i8 



Journal of Agricultural Research 



Vol. XIX. No. 9 



between the kernels at the base of the spike and those at the tip, is not 

 an accurate indication of the storage of nutrient material. The curve 

 of wet weight is quite similar to that published by Brenchley (j). The 

 losses after maturity found by Brenchley were not evident at Aberdeen, 

 becaase the sampling was not carried to the same point. Brenchley in- 

 cluded the glumes in the weights, while at Aberdeen these were removed. 

 As the glumes can not be removed after maturity, their removal shortens 

 the period of study. On the other hand, the glumes themselves change 



TO 



CO 



^o 



-^o 



oK? 



^O 



/£? 



/ s 3 ■^ ^ e' -z s s yo y/ /£ /s jv /^ ya- yr ya y» ^o£/ ^^^ss^£^ /^zoH'^ypz/u^ 



Fig. 9. — Graph showing wet weight of individual kernels 5, 8, and 10, by days, from date of flowering to 



near maturity in 1917. 



materially in character between flowering and maturity, and their elimi- 

 nation removes one source of error. 



INCREASE IN DRY MATTER 



The daily growth of the kernel is summarized in the daily increment 

 of dry matter. While there are gradual changes in the percentages of 

 the various substances for days of the same week, the added constituents 

 bear a more or less uniform relation to each other. The sum of the daily 

 additions is the increase in dry matter. This increase has been so uniform 

 at Aberdeen as to indicate that the plants were working very nearly at 



