No.594] SHORTER ARTICLES AND DISCUSSION 373 



How are we to interpret these results ? Why should there be 

 such a preponderance of peritamerous leaves produced during 

 the early growth period of the plant, then a preponderance of 

 trimerous leaves during the latter part of the season? 



The records obtained for 1915 for the slip plants added but 

 little to the 1914 records. The leaf production of slip plant No. 

 3, however, is interesting. In 1914 this slip plant produced 4 

 trimerous, 2 tetramerous and 4 peiitanierous leaves. In 1915, 

 however, it produced trimerous, tetramerous and 4 peiitani- 

 erous leaves— showing strongly the inherited tendency to pro- 

 duce the pentamerous leaves during the second season. Clover 

 heads were produced during the summer of 1914, but no seed 

 was found in them. 



No leaves were produced by this plant having more than five 

 leaflets, a condition that obtained during the first three genera- 

 tions of De Vries's race, yet later he obtained both 6- and 7- 

 merous leaves in abundance. A frequency polygon is plotted 

 (see figure) for the leaf variations of this red clover mutant. 



