Hcliaiillius .liiinnis Syiicotylcus. 



475 



in a lower row of nnmbers. 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 com])are this curxc witli the groups of figures 

 representing the tricotylous half races, we 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 



Fig. 99. HcUanthiis annuus syncotylcus. 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%, (Scropluilaria) 

 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 tin's case as in the other, had been directed 



