BATESON AND PUNNETT 



55 



Table I 



* Owing to late germination and consequent failure to flower. 



cross are considered elsewliere (p. 12) 

 in connection with gametic coupling. 



The hiheritajice of the 

 Hooded Character 



Tiie work of the past two seasons 

 has consisted largely in the investiga- 

 tion of the peculiar transmission of the 

 hooded standard. The hood is con- 

 stituted by a more or less pronounced 

 folding downwards of the top and 

 sides of the standard or vexillum ^ (cf. 

 Fig. 1). The hooded varieties may be 

 of almost all the colours known in 

 Sweet Peas— white, cream, red, pink, 

 'mauve, purple— but so far as we have 

 observed, the hood never occurs in the 

 purple bicolor or Purple Invincible 

 (P. I.), or in the corresponding red 

 bicolor or Painted Lady (P. L.). In all 

 the hooded t\'pes standard and wings 

 are more alike in tint; and there is 

 therefore some interdependence be- 



tween colour and form such that either 

 the bicolor character prev'ents the de- 

 velopment of the hood, or the develop- 

 ment of the hood modifies the colour.^ 



■5 This shape is associated with, and per- 

 haps caused by, absence of the central notch 

 which is conspicuous in the middle of the 

 erect standard of old-fashioned flowers. The 

 shape of the buds in the two types is conse- 

 quently very distinct (see figurer.) . 



^ The purple hooded types produced in 

 these experiments are those known as Duke 

 of Westminster and Duke of Sutherland re- 

 spectively. The former corresponds with 

 P. I., and the latter is represented among the 

 erect types by the purple with purple wings 

 referred to in these Reports as P.p.w. 



The colour difference between hooded and 

 flat types is not easy to express, but may 

 readily be perceived when a collection of 

 Sweet Peas is examined. In the erect purple 

 and red bicolors the colour of the standard 

 contains a red quality distinguishing it from 

 that of the wings, which are more blue in 

 the case of purples and more pink in the case 

 of reds. While in a purple bicolor the stand- 

 ard is a chocolate red and the wings are blue 

 or purple, the corresponding hooded type 

 has both parts purple. Similarly in a red bi- 

 color the colour of the standard is a scarlet 

 and that of wings pink or pinkish-white, 

 while in the corresponding hooded type the 

 pigment of both parts is pink. When, as 

 sometimes happens, the standard and wings 

 of a hooded type differ in colour, the dif- 

 ference is rather in the amount of pigment 

 than in its quality, the standard being fuller 

 and the wings lighter, but the pigments of 

 both parts show little difference in tint. 



