14 (206) SURPASSING UPWARD AND DOWNWARD OF THE INDICES 
TABEESN IDS 
Number 
of the | Parents. ~ Children. 
family. | 

= 
SALATA ON (7650632576 707 700012. 
182 80 18118100 078,278, 78, 711,210) 
86 2» 19 1780,79 79, 978,2 One OF 
34 80 19 1279,19, WE 1 Sel dee 16,010, An 
38 80 191781, E50 ATI 79, 219 PLO TE ET LO LE 
2698 82 1821877 TT eg O14: 
34e 81 ZE MA80 PBO TI OL 
248 81 CONGO RLD AT TON 
82 86 B12%1463,2608 202 162460 79/0708) 
82b 85 83 | 84, 80, 78, 78, 78, 74. 
„ I 

| 
The presence in the off-spring of specimens that possess a quali- 
tative property stronger or weaker than both parents has been explained 
by the polymery-theory in which is accepted that some factors work- 
ing in the same direction define a property NILSSON-EHLE (1909, 
1911, ) East (1916), T. TAMMES (1911), FRETS (1920). It is very diffi- 
cult to explain by means of this theory the proportions of numbers for 
a special material. Completely this has been done by NILSSON.EHLE 
only (1909 and 1911). 
The surpassing of both parents by the children with respect to any 
property has been especially elucidated by NirssonN-Enreforthehered- 
ity of the length of internodiae of oats with crossings of a compactum- 
race and other races with an average length and with a large one (1911, 
S 26—56). NILSSON-EHLE explains these experiments by accepting two _ 
lengthening-factors L with mutual dominance and of a shortening- 
factor C’’a suppressing-factor, which is dominant over both L factors.” 4) 

1) It is important that, as is taught by the experiments, both L-factors do not work 
simply accumulatively. Nırsson-EHLE (1911, S. 47) thinks it most probably that each 
L-factor denotes a small lengthening only and that through the operation of both 
factors a greater lengthening takes place (see also 1909, S. 99). In one case however he 
finds that plants which possess, according to the experiment, one L-factor only have 
nearly as long internodiae as plants, which, according to the experiment have two L- — 

d'in Aen 
GER: pn 

