Helianthus Ann it us Syncotyleus. 
475 
in a lower row of numbers. The asymmetrical form of 
the curve is seen at a glance, although the selection which 
preceded this generation was limited to two years only. 
If we compare this curve with the groups of figures 
representing the tricotylous half races, w r e see that it 
is not simply its mirror-image. It is true that both have 
their highest point over or close to the end of the base 
line. But in the case of the half race the longer side of 
98 p Ct 
3 Ind. 
Fig. 99. Helianthus annuus syncotyleus. Curve of the 
hereditary values of 55 syncotylous offspring of a parent 
with 81% (Culture 1890). Given as a type of a curve 
resulting from selection. 
the curve extends seldom so far as 25%, (Scrophularia} 
and ordinarily much less, and this in spite of the selection 
in the plus direction (see the table on p. 392). In the case 
of Helianthus, however, the longer side extends almost 
to the middle or about 60%, and this in spite of the selec- 
tion of the best syncotyls with the highest values. If the 
selection, in this case as in the other, had been directed 
