A GENETICO-PH Y SIOLOGICAL STUDY ON THE FORMATION ETC. 
35 
Name of plant 
Part examined 
Chromogen 
p p 
Remarks 
Labiateæ 
Mentha arvensis var. 
piperascens 
Lf. 
— 
IV 
Cncurbitaceæ 
Cucurbita moschata var. 
Toonas 
Fruit. Peri. 
+ 
+ 
Fully riped, yellow. 
99 99 
„ Int. 
+ 
— 
Cucumis sativus 
„ Peri. 
— 
VI 
• 
99 99 
„ Int. 
— 
— 
Composite» 
Arctium Lappa 
Root. Peri. 
— 
— 
99 99 
„ Int. 
— 
— 
Carthamus tinctoria 
Lf. 
x(BG) 
x (OR) 
>» 99 
Flower bud 
x(BG) 
S' 
O 
X 
II. Genetical Study. 
1. The Mode of Inheritance of Anthocyanin and Brown 
Pigment in the Awn and other Parts 
in Oryza sativa. 
In the preceding chapters, certain physiological relations in the formation 
of anthocyanin and the reddish brown pigments to the cliromogenic substances 
are discussed. We shall now consider the genetical factors relating to the 
formation of these pigments in the awn, paleas, glumes and the grain of 
Oryza sativa. 
(a) Colour Types of the Awn. 
Among the number of cultivated varieties of Oryza sativa var. utilissima 
and 0. s. var. (jlutinosa , many are awned. They may be grouped under the 
following types with respect to the colour of the awn. 
1. Awn with anthocyanin. 
a. Purple. 
b. Bed. 
2. Awn without anthocyanin. 
