124 
Journal of Agricultural Research 
Vol. XI, No. 4 
COMPARISON OP UPPER AND LOWER EARS ON THE UPPER- AND LOWER- 
EAR PLOTS 
The “upper-ear plots” were started by selecting seed from upper ears 
for the purpose primarily of determining the ratio of the number of 
Fig. ii.— Graphs showing the mean weight of the ears in the two-ear strains of Indian com, 1908-1916. 
stalks with single ears to the number that have two ears in the offspring 
of such parents. In succeeding years, the upper ears continued to be 
1916. 
selected for planting. This perhaps defines sufficiently what is called 
the “upper-ear plots.” Similarly on the “lower-ear plots” the lower 
ears were selected for planting. In the present paper we are not con¬ 
cerned with the primary purposes of the experiment, but with the effects 
