STUDIES ON MENDELIAN FACTORS IN AQUILEGIA VULGARIS 183 
will be concealed. The disturbing influence of these factors may be 
avoided by measuring the segregating lines, of course. 
The tables 8—12 show the variation of the height of the stem in 
. the types of segregation. The difference in height between the red 
and dark-blue, and between the light-blue and white is striking. 
Though the number of individuals is rather small a statistical 
examination has been made of the differences in height between the 
colour types; I considered it necessary to examine the effect of each 
factor separately. 
TABLE 8. The variation of the height of the stem in Ds. 
D.-plants BbRr. 
Height of the stem in cm. Standard 
Flower colour. | Total | Mean | error 
| 50 60 70 80 90 | e(M) 
Dark-blue | 4 | 27 | ar BG 432 OOS) 129 | Ors | 0e 
BEN A | er 
Red = Bald 7 | au et Los | 69,3 | 1,63 
Light-blue 1 ER ST Ae aes ary acer ees 
| | | | 
| 
White 1 he et 2 | os — 1 16 | 60,6 1,97 
TABLE 9. The variation of the height of the stem in Ds. 
D,-plants BbRR. 
Height of the stem in cm. 
Flower colour. Total | Mean 
70 80 90 
Dark-blue.....n......... 1 | 5 | 13 | 4 23 | 837 
| | | 
Bee En BE | 4 | 3 get Boel 
| 
The effect of the presence of the red factor contra its absence is 
to be seen in the tables 8 and 11. In tab. 8 the average of the stem- 
height of the red flowering plants is 69,3 + 1,6 and of the white 
flowering 60,6 cm. + 1,97. The difference is 8,7 cm. + 2,56 which gives 
the value of difference : standard error [D:&(D)] =3,0. In table 
11 the difference of the means of the red and the white flowering 
plants is 8,6 cm. + 1,6, and D:&(D) =5,2. Thus the differences in 
both cases are more than 3 times their standard error; consequently 
