4G 



I. XAGAI ; 



The clu-omogenic substance eau be detected in the extract of the milk ri^ie, 

 green grains of the redtlish brown sort but not in that of the pale buif. 



Table 19. 



Chromogen content in the extract of the milk-ripe 

 grain of OtxJki sntiva >. 



As we have already seen the clu'oiuogen in the awn belongs to the group 

 of the chi-omogenic substance F, and in the gi'ain, to the chroniogenic sub- 

 stance P. 



According to Kondo (1917),' the redtlish brown pigment of the gi-ain is 

 confined to a single cell layer of the integument of the seed coat. In the dark 

 colom-ed gi'ain of the foreign sort, the -«Titer observed that the pigment ivas 

 not confined to the seed coat. An anthocyanin-hke pigment was foimd in the 

 jiericarp, namely tjie layer above the tube cells and even in the grain of tlie 

 brown sort of Japanese rice, a yellowish pigment was found in the cell of 

 the pericarp. 



Paenell et .Al^ have shown that in Indian rice, the red, grey brown, and 



1. Three grams of fresh material were extracted with 15 cc of a 40 ]X?r cent alcohol. 



2. The extract was boiled with catistic potash. A deep blue colour like that produced by 

 the solution of myricetin was found. On cooling, the blue calour changed to red. It may in- 

 cidentally be mentioned that most of the flavones give a deep yellow colour when treated with 

 caustic jiotash, but myricetin gives a deep blue instead of yellow. 



3. KosDo, M., Untersuchung neber ilic Dicke der Beiskleischicht. Bericht, d. Ohara Inst. f. 

 Landwirt. Forsch. 1 : 219, 1917. 



4. See also lÜKK.twA, S., On the Classification of Cultivated Eice. Jour. Coll. .Vgri. Imjier. 

 I'niv. Tokyo. 3:11. 1912, Pakxell et al. Loc. cit. 



