24 



I. XAGAI : 



"Bell," "Esther," "Eatou" (whites), "Highlaud," " Hartford Prolific " 

 (blacks), and " Iowa " (red) showed likewise the marked coloiu- reactiou of 

 the ohroinogeiiic substance P. 



Apples, peal's, oranges, Kaki fi'iiits, strawberries, bananas and other fruits 

 and vegetables Avere examined, the results of which were listed and given in 

 Table 13. 



In certain plants, the chromogen reaction failed when tested just before 

 the formation of anthocyanin. The leaf scale of the bulb of Liliuta tujrimim 

 is devoid of anthocyanin when it lies underground. But it becomes pmiJe in 

 exposure to sunlight. Even a few hoiu:« exposm-e causes the purple spots to 

 appear on the surface of the yellowish white leaf scale, and the coloured area 

 extends graduallj* to the entire scales, within a few days. The alcohohc 

 extract of the suitable material, however, shows practically no reaction of 

 either chromogen. 



The potato tuber is another example of this kind. Two kinds of white 

 tubei-s are known. One is such that the tubers ai'e devoid of anthocyanin as 

 long as they are in the ground but by exposm'e to sunlight, they become 

 deep purple. The other is such that, even when expossd tt) the light for a 

 long time, no anthocyanin is produced. The exti-act of both kinds of white 

 tubers showed a very feeble reactiou of ths chromogens. It seeins that the 

 anthocyanin maj' be formed so rapidly from tha raw material in these instances 



