212 MENDELISM 
in combination with C and R, produces the purple 
or Picotee colour (blue), whilst its absence (0) in pre- 
sence of C and R is accompanied by the appearance 
of the red colours—Painted Lady and tinged white. 
Purple Invincible and Painted Lady are regarded as 
intensified forms of Picotee and tinged white respec- 
tively. The presence of the second factor (T) is attended 
by the <a o, of the full colours purple and 
26 
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c 
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Cr 
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cer 
Fic 16. 
The shaded squares represent coloured plants, the blank squares 
white plants. 
Painted Lady ; its absence (¢) causes the appearance of 
the diluted forms Picotee and tinged white. 
B and T may be present when either C or R or both 
are absent ; the resulting plant has then white flowers. 
And it is interesting to notice that the ultimate recessive 
white, containing c 7 b ¢, occurs only once among 256 
individuals of F,. The whole apparently complex system 
of floral colours is thus explained by the simple Men- 
delian behaviour of four separate pairs of allelomorphs. 
Bateson and his collaborators have, therefore, provided 
